Ent. Rev. Japan, 63 (2): 109-120, December25, 2008

New or Little-known Tenebrionid Species(Coleoptera) from Japan(7) Revisional Study of Borboresthes(Tenebrionidae: AIIeculinae) Species

from the Ryukyu Islands

Katsumi AKITA

Hisai-iba-cho66, D-304, Tsu City, Mie Pref.,514-1108 Japan

an d

Kimio MAsUMoT0

Institute of Human Culture Studies, 0tsuma Women's University,Tokyo,102-8357 Japan

Abst rac t A11eculine Bo,・bo,・esthes species from the Ryukyu Islands are re-examined. Twonamed species, orbo''esf/1es a加 'e'Isis MAEDA et NAKANE and o''00''esr/1es ama'malulsM AEDA et NAKANE are re-recorded from their original localities, and newly recorded fromIriomote-jima Is., and Okinoerabu-jima Is.、 respectively. Four new species are described:Bo,・bo,・est/1es htra11 sp nov.. B ki,ml1・al sp nov., B oil,no,1101 sp n o v and B. nakanei sp n o v .A key to all the species from these islands is also provided.

This is the seventh part of the new or little-known tenebrionid species from Japan, and dealswith a revisional study of Borbolesthes(Alleculinae: Tenebrionidae) species from the RyukyuIslands.

MIYATAKE(1985) illustrated two species of this genus only from the main islands of Japan(included Tsushima Is). Just a few years later, MAEDA and NAKANE(1988) described two newspecies, Borbo,esthes amamianus from Amami-oshima Is., and B kabirensis from Ishigaki-jjma Is., respectively. SAsAJl (1989) enumerated only B fulginosus from the Ryukyu Islands(Yaeyama Islands). AzUMA et a1. (2002) listed two species, B amamlanus and B tut9mosuSkabjrensls from the Ryukyu Islands. FromIriomote-j ima Is. of the Ryukyu Islands, MIWA(1g33) recorded a problematic species B fttlgtnosus originally described from Sze-tChOuen(chjna) presumably, jt must be a misidentification of one of the species from the RyukyuIslands to be mentioned in this paper.

Before gojng further in details, the authors wish to express cordial thanks to Mess「S the lateIsamu HIRAl (Sajtama), Satoshi INADA(Okinawa), the late Atsuo IZUMI (Tokyo), Hi「emuKAMEzAwA(Tokyo), Tatsunosuke KIMoT0(Tokyo), Masaaki KIMURA(Okinawa), Sadahi「oOHMoM0(Ibaragj), Hjdehiro ONoDERA(Ibaragi), Hiroshi OTOBE(Mie), TakaShi SHIMADA(shjzuoka), for offering the type materials. The authors also appreciate D「. MakOto KluCHI,Tsukuba City for his taking the photographs inserted in the Present PaPe「.

110 Katsumi AKITA and Kimio MAsUMoTo

The ho1otypes will be deposited in the collection of the National Museum for Nature andScience, Tokyo (NSMT).

Borboresthes kabirensis MAEDA et NAKANE, 1988

[Japanese name: Ishigaki-tobiiro-kuchikimushi](Figs. 1,7, 13 and 19)

Bo,-bo,esthes kabi,-ensis MAEDA et NAKANE, 1988, Rev. Miyazaki Sangyo-keiei Univ., 1: 6 (Kabira,Ishigaki Is ).

Specimens examined. Ishigaki-jima Is: 1 (Fig. l ), 1 早, emote, 17. V 2000, 1. HIRAI leg; 1 早,Mt.0moto-dake,100-525m,6. V.1993, K. AKITA leg;1 早, ditto,20. IV. l993, K. AKITA leg;1 (11、, ditto,6. V.1994, H. 0ToBEleg; l 早, ditto,29. V.1992, H. KAMEzAwAleg;1 , ditto, 1-7. V. 1994, H. 0TOBEleg;2早早, Mt. Yarabu-dake,20-180m,1. V.1993, K. AKITA leg; l 早, ditto,1-7. V.1994, H.0ToBEleg ; 1 l , ditto,5-8. V.1994, H. 0ToBEleg; 1 早, Hirakubo,14. IV.1998, C. END0 leg;1 早, Mt.Buzama-dake,17. IV.1998, S. 0HMoM01eg;1 早, Shiramizu,5. V.1994, H.0ToBEleg;2早早, Takeda,17. IV. 1993, H. 0NoDERA leg ; 1 , 1 , Yonehara, 23. V. 1973, T. NAKANE leg. (NSMT-I-C 44827,44832);1 (i'、, ditto,9. VI.1982, A. IzuMl leg; Iriomote-jima Is:2早早, Aira-gawa Riv.,4. V 2003, H.OToBEleg; 1 (11、, ditto,28. IV 2003, T. KURIHARAleg;1 (11、, Gunkan'iwa- Kampira-no-taki, 3. V. 1995,H. KAMEzAwAleg; 1 , Sonai-dake, l8. V 2000, 1. HIRAl leg;1 早, Urauchi-gawa Riv.,19. V 2001, T.SHIMADAleg; 1 , Shirahama, 4. V 2003, J. 0KAMURAleg.

Distributior1. Ishigaki-j ima Is., Iriomote-j ima Is. [New Record].

Borboresthes amamianus MAEDA et NAKANE, 1988[Japanese name: Amami-tobiiro-kuchikimushi]

(Figs 2,8,14 and20)

Borbo'esthes a'na'nianus MAEDA et NAKANE, 1988, Rev. Miyazaki Sangyo-keiei Univ., 1 : 5 (AmamiOshima).

Specimens examined. Amami-oshima Is: 1 (11、 (Fig. 2), Kominalo, 5 m,2-9. V. 1999, K. AKITA leg1 早, ditto, 21. V 2007, H. 0ToBEleg; 0kinoerabu-jima Is: 1 , Mt. 0o-yama, China_oho, 22_23. v1993, 1. HIRAl leg.

Distribution. Amami-oshima Is.,0kinoerabu-jima Is. [New Record].

Borboresthes hiraii sp n o v.[Japanese name: Hirai-tobiiro-kuchikimushi]

(Figs 3,9,15, 21)

Body eton9ate-elliptical, moderately convex dorsad; dark reddish brown to dark yellowishb「own, head eXCludin9 apical part, pronotoum and elytra dark grayish brown, scutellum lighterin Co1ou「, apical Part of head, mouth parts, antennae and legs brownish yellow, hairs on dorsalSu「face yellow with feeble brownish tinge; dorsal surface weakly, rather serjceously shjnjng,

Bo,-bo,-est/1es from the Ryukyu Islands

4 6Figs. l -6. Bo,-bo,-esthes spp. . habi tus. - l , B. kab1,-ensls MAEDA et NAKANE: 2、 B a11lanl ian lls MAEDA et

NAKANE:3. B. /111・ail sp nov.. hOlOtype:4. B. kl1川l''at sp nov., hOlOtype: 5、 B. 0/1'110'not Sp nov., hOlotype;6, B. nakane1 sp nov., holotype. Scale =5 mm

prosternum hardly shining, metasternum and abdomen gently, somewhat vitreously shining;dorsal surface rather densely clothed with decumbent long hairs; ventral surface rather denselyclothed with decumbent hairs.

Head subtrapezoida1 and rather flat, closely punctate and clothed with fine and rather longhajrs, the punctures often confluent with one another in anterior part; clypeus subquadrate, notdefjned from frons, with apical part produced, feebly narrowed anteriad and truncate in front;genae(areas before eyes) rather small, subtriangular, hardly produced laterad, weakly raised inmjddle, almost impunctate; frons feebly convex, weakly inclined anteriad; areas near eyes gen-tly depressed, with rows of punctures along eyes. Eyes transversely subreniform in dorsal view,gently convex exteriad, with interior parts comparatively narrowly inlaid into head. Antennaefiliform, reaching basal 2/5of elytra, ratio of the length of each segment from base to apex:0.3 6. 0.16. 0.54. 0 . 63, 0.57, 0.50, 0.48, 0.49, 0 . 45, 0.50, 0 .48.

l l2 K atsumi A iaTA and K imio M AsUMoTo

P ronotum subtrapezoida1 in dorsal view, very closely, somewhat umbilicately punctate,covered with fine hairs; apex roundly produced anteriad, finely rimmed in lateral parts; basewholly margined, weakly produced in medial part, feebly emarginate in front of scutellum,rather noticeably sinuous on each side; front angles rounded but not seen from above, hindangles feebly angulate in dorsal view; sides steeply declined to lateral margins in anterior parts,gently so in lateral margins, which are finely bordered; disc moderately convex, closely andrather umbilicately punctate, each puncture with a subdecumbent1ong hair. Scutellum subtrian-gular, feebly convex, rather asperate, covered with fine hairs.

Elytra about 16 times as long as wide,3.8 times the length and 13 times the width ofpronotum, widest at basal 3/8; dorsum rather strongly convex, highest at basal t/4, very weaklyflattened in intero-basa1 part; disc punctate-striate, the striae in antero-interior parts often dis-continuous, the punctures in striae small and closely set; intervals feebly convex, weakly cov-ered with isodiametric microsculpture, scattered with small, feebly transverse punctures, eachwith a minute protrusion at the anterior edge and a decumbent long hair; humeri weaklyswollen; apical parts rounded.

Terminal segment of maxillary palpi widened apicad, truncate at apex, with rounded inte-rior side. Prosternum coarsely, closely punctate and wrinkled; mesosternum coarsely punctate;metasternum weakly covered with isodiametric microsculpture, scattered with punctures, eachwith a bent short hair. Abdomen closely, finely punctate, each with a decumbent hair, lateralparts of 3rd sternite, major parts of 4th and whole part of 5th weakly covered with isodiametricmicrosculpture;5th(anal) stemite without special modification.

Legs moderate-sized and ordinary in shape in the members of this genus; 3rd and4th seg-ments of pro- and mesotarsi rather noticeably dilated towards each apex, 3rd the widest;metatarsi with3rd segment feebly widened; ratios of lengths of pro-, meso- and metatarsal seg-m e n ts: 0.30, 0.15, 0.18, 0.25 , 0.49; 0.60, 0.23, 0.24, 0.48; 1 .00, 0 .33,0.28, 0 . 50.

Male genitalia about 13 mm in length and 0.3 mm in width; basal piece bold in majorbasal part, rather strongly nalTowed anteriad; fused parameres somewhat subrhombic, gentlybent ventrad at the border of basal piece,0.26 mm in length, somewhat nib-shaped.

Body length: 7.2-8.6 mm.Type series. Holotype. , Amami-oshima Is., Uken-son, Chuo-rindo,150-300m,22_24.

VII i999, K. AKITA leg. Paratypes. Amami-oshima Is:1 ,3 早早, same data as the holotype;1 , Uken-son, Mt.Yuwan-dake, 2. VII i994, 1. HIRA11eg; 1 早, Kinsakubaru, 26_27. VI.2001, 1. HIRAI leg;1 (i'、, Uragami,22. V. 1960, K. YAMADAleg;1 , Naze, 12. VI. 1960, K.YAMADAleg; Takara-jima Is:2早,6. VI.1981, J.0KUMAleg.

Distribution. Amami-oshima Is., Takara-jima Is.This specific name is dedicated to the late Mr. Isamu HIRAl, who supported our present

study and is one of the collectors of the type materials.

Borboresthes kimurai sp nov.[Japanese name: Tarama-tobiiro-kuchikimushi]

(Figs 4,10, 16, 22)

Body e1ongate-subelyptica1, moderately convex dorsad; dark reddish brown, apjca1 part ofhead, mouth Parts, antennae, femora and tibiae dark yellowish brown, tarsi dusky yellow, hajrs

Borbo,-est/1es from the Ryukyu Islands

12

Fjgs 7_l2. Head and pronotum ( ). - 7, B kabi1-ensls MAEDA et NAKANE. 8, B amamianuS MAEDA et

NAKANE;9, B. hi1・ail sp nov., hOlOtype;10, B. ki1川l''al sp nov., hOlOtype; 11, B. 011n10mOi SP・ nov・, hOlO-type;12, B nakanel sp nov., holotype. Scale=1 mm.

113

l l 4 Katsu mi AKITA and K imio M AsUMoTo

on head, pronotum and scutellum dusky yellow, those on major part of elytra a feebly brownishyellow, and those on antennae and legs dark yellowish brown to pale brown under a certainlight; head, pronotum and scutellum dully shining, elytra weakly, somewhat sericeously shining,ventral side of neck vitreously shining, prosterunum hardly shining, metasternum and abdomenweaky, somewhat vitreously shining, abdomen gently, somewhat sericeously shining; dorsalsurface rather densely clothed with recumbent long hairs, ventral surface rather densely clothedwith shor t recumbent hairs.

Head subtrapezoidal and rather at, weakly covered with isodiametric microsculpture,closely punctate, clothed with fine, not so long hairs, the punctures often con?uent with oneanother in anterior part; clypeus subquadrate, roundly defined from frons, feebly depressedagainst frons, gently produced and subpara11e1-sided, weakly inclined anteriad, and truncate infront; genae rather small, subtriangular, hardly produced laterad, weakly depressed in posteriorparts before eyes, weakly punctulate; frons feebly convex, weakly declined to fronto-clypea1border, which is evenly curved and reached to lateral margins; areas along interior parts of eyesweakly rugoso-punctulate. Eyes transversely subreniform in dorsal view, gently convex exteri-ad, with interior parts comparatively narrowly inlaid into head and bordered from head bygrooves. Antennae filiform, reaching basal t/3of elytra, ratio of the length of each segmentfrom base to apex: 0.32, 0.12, 0.48, 0.52, 0.46,0.45,0.44, 0.49,0.40,0.40,0.43.

Pronotum subtrapezoida1 in dorsal view, very closely, feebly umbilicately punctate, cov-ered with decumbent fine hairs, which become longer in lateral parts; apex roundly producedanteriad, finely rimmed in major lateral parts; base wholly bordered by a fine deep groove,weakly produced in medial part, feebly truncate in front of scutellum, rather angularly sinuouson each side; front angles rounded but not seen from above, hind angles rectangular in dorsalview with corners rounded; sides steeply declined to lateral margins in anterior parts, gently soin lateral margins in posterior parts, both of which are wholly finely rimmed; disc moderatelyconvex, covered with isodiametric microsculpture, very closely and weakly umbilicate-punc_fate, each puncture with a rather recumbent long hair. Scutellum subhexagona1, convex, weaklycovered with isodiametric microsculpture, rugu1oso-punctulate, and clothed with fine decum_bent hairs.

Elytra about l6 times as long as wide,3.5 times the length and slightly less thant 3 timesthe width of pronotum, widest at basal t/4; dorsum rather strongly convex, highest at basal t/4,very weakly flattened in interior-basal part; disc with rows of punctures, which are closely setand mostly connected by shallow grooves, each puncture with fine decumbent hajr; jntervalsfeebly Convex, very weakly covered with isodiametric microsculpture, rather jrregularly seat_te「ed with small, feebly transverse punctures, which are often connected wjth one another andfo「min9 t「ansverse wrinkles, each puncture with a minute protrusion al the anterior edge and arecumbent long hair; humeri weakly swollen; apical pari rounded.

To「minal So9ment of maxillary palpi subsecuriform, with inferior side shortest and gentlyCu「Vcd, eXte「iO「 Side gently curved, about 16 times longer than the jnlerjor jnlength, apex near_1y St「al9ht, 1.8 times longer than the interior. Prosternum rugu1oso_punctate; mesosternumCOa「Sely Punc tate, metasternum weakly covered wi th isodiametric mjcrosculpture, scatteredWith PunCtu「eS, each with a short recumbent hair; abdomen closely, finely punctate, each with a「eCumbent She「t hair. Abdomen rather closely punctate, each with a recumbent short hajr, lateralPa「tS of 2nd Ste「nife, major parts of 3rd and whole part of 4th and5th weakly covered wjth 1so_diamet「IC miC「oSCulPture, lateral parts of 1st and2nd and4th sternites and basal and lateral parts

Bo,-bo,-est/1es from the Ryukyu Islands

13

17 18

115

Figs. 13 - 18. A n tenna ( f ). - 13,B. kabi''ensts MAEDA et NAKANE;14, B a'na'n ianus M AEDA etNAKANE; 15, a li i''all sp n ov.,holotype;16, B. kimll1-at sp nov.,holotype; l 7, B o/111tomo1 sp.nov., holotype; l8, B. nakanei sp.nov., holotype. Scale=1 mm.

of 3rd longitudinally wrinkled, male5th stemite feebly attened in middle.Legs moderate-sized and ordinary in shape; 3rd and4th segments of pro- and mesotarsi

noticeably dilated towards each apex, 3rd the widest; metatarsi with 3rd segment gentlywidened; ratios of lengths of pro-, meso- and metatarsal segments:0.25,0.18,0.21,0.28,0.43;0.48, 0.25,0.23,0.28, 0.40; 0.83,0.33, 0.28,0.45.

Male genitalia elongated fusiform in dorsal view, about 15 mm in length and 0.25 mm inwidth; basal piece gently narrowed anteriad; fused parameres somewhat nib-shaped, directedanterior-ventrad,0.25 mm in length.

Bodylength:7.0-7.6 m m .Type series: Holotype. , Tarama-j ima Is.,3. VI. l996, M. KIMURA leg. Pa「atyPeS 3早

早, same data as the holotype.Distribution. Tarama-j imaIs.Thjs specjfic name is dedicated to Mr. M. KIMuRA, who provided us with a So「ieS of the

type materials.

116 Katsumi AKITA and Kimio MAsUMoTo

Borboresthes ohmomoi sp n o v .[Japanese name: 0hmomo-tobiiro-kuchikimushi]

(Figs 5, 11, 17, 23)

Body e1ongate-elyptica1, rather strongly convex dorsad; head excluding apical part, prono-toum and scutellum dark reddish brown with feeble coppery tinge, elytra, metastenum andabdomen mostly dark brown, anterior part of head, basal parts of antennae, meso- and metaster-na, femora and legs mostly reddish brown, apical parts of antennae, mouth parts and tarsi yel-lowish brown, hairs on dorsal surface dusky yellow with feeble brownish tinge; head and prono-tum gently shining, scutellum and elytra weakly, rather sericeously shining, ventral side of neckstrongly and vitreously shining, prosternum hardly shining, mesosternum and metasternum gen-tly, somewhat vitreously shining, abdomen weakly and rather sericeously shining; dorsal sur-face rather densely clothed with recumbent long hairs; ventral surface clothed with recumbentshort hairs.

Head subtrapezoida1, closely punctate and clothed with fine hairs; clypeus subquadrate,weakly inclined anteriad, feebly narrowed anteriad and truncate in front, fronto-clypea1 bordercurved and shallowly grooved; genae rather small, subtriangular, feebly produced anterior-later-ad, weakly raised in middle, gently declined to eyes; frons feebly convex, weakly inclined ante-riad and to eyes, the punctures often con?uent with one another in anterior parts. Eyes trans-versely subreniform in dorsal view, gently convex exteriad, with interior parts comparativelynarrowly and roundly inlaid into head. Antennae fili form, reaching basal t/3 of elytra, ratio ofthe length of each segment from base to apex:0.34,0.13,0.48,0.64,0.54,0.50,0.48,0.54,0.45,0.45 , 0.44.

Pronotum subtrapezoida1 in dorsal view; apex roundly pl・educed anteriad, almost whollyand finely rimmed; base wholly finely bordered, weakly produced in medial part, feebly truncatein front of scutellum, rather noticeably sinuous on each side; front angles rounded, scarcely seenfrom above, hind angles subrectangular with rounded corner in dorsal view; sides gentlydeclined to lateral margins, which are finely bordered and visible in whole areas from above;disc moderately convex, closely and feebly umbilicately punctate, each puncture with a recum-bent long hairs, these in lateral parts becoming bolder than those in central part. Scutellum trian-gular with feebly rounded sides, very weakly convex in medial part, shallowly punctulate,sparsely covered with fine long hairs.

Elytra about 17 times as long as wide, 3.4 times the length and 13 times the width ofpronotum, widest at basal2/7; dorsum rather strongly convex, highest at basal2/7; disc puncta_to-striate, the punctures in striae small and closely set; intervals weakly convex, very feeblyCove「ed with isodiametric microsculpture, scattered with small, somewhat transverse punctures,each With a minute Protrusion at the anterior edge and a recumbent long hair; humeri weaklyswollen; apical part gently rounded.

Te「mina1 Segment of maxillary palpi widened subsecuriform, with interjor sjde shortestand Weakly 「ounded, exterior side nearly straight and about 1 .5 times jn length of jnterjor, andapex Sli9htly curved and 17 times of the same. Ventral side of neck noticeably convex, pol_iShed. P「oSte「num wrinkled; mesosternum coarsely rugu1oso-punctate; metasternum weaklyCove「ed With iSOdiametricmicrosculpture, scattered with punctures, each with a recumbent shorthai「. Abdomen mostly, weakly covered with isodiametric microsculpture and1ongjtudjna11yW「inkled, 「athe「 Closely, finely punctate, each with a recumbent fine hajr;5th sternjte semjcjrcu_

Bo,・bo,・esthes from the Ryukyu Islands 117

Figs. l9-24. Male genitalia. - 19, B. k:abl,ensls MAEDA et NAKANE 20, B a na,n1-atltls MAEDA et NAKANE; 21. B il l''all sp nov., holotype;22, B. kim1l,-a1 sp nov.,holotype; 23, B. clime,noi sp nov., holotype; 24, B. nakanel sp nov., holotype.Scale = 1 mm.

1arly emarginate at apex in male.Legs moderate-sized and ordinary in shape in the members of this genus; 3rd and4th seg-

ments of pro- and mesotarsi rather noticeably dilated towards each apex, 3rd the widest;metatarsi with3rd segment feebly widened; ratios of lengths of pro-, meso- and metatarsal seg-ments: 0.40, 0 . 18, 0.19, 0.25, 0 .45; 0.60, 0.25, 0.23 , 0.28, 0.49; 1 . 10, 0.33, 0 . 27, 0.48.

Male genitalia slender, about 18 mm in length and 0.3 mm in width, gently curved in lat-eral view; basal piece prolonged and narrowed in anterior 1/3; fused parameres sublinguiform indorsal view, 0.3 run in length.

Bodylength:7.9-9.3 m m .Type series: Holotype d''、, Ishigaki-jima Is., Mt. Buzama-dake, l7. IV.1998, S. 0HMoMo

leg. Paratypes. Ishigaki-jima Is : 1 , same data as the holotype;1 , Arakawa, 18. VI. 1995, C.END01eg;1 (j1、,1 , Yonehara,1-7. V. 1994, H. 0ToBEleg; Iriomote-j ima Is : l , Aira-gawaRiv.,23. m.1999, S. INADAleg;1 早, ditto,4. V 2003, H. 0TOBEleg;1 f, dittO,28. IV 2003,T. KURIHARA leg ; 1 , Nakama-gawa Riv., 1. V. 1994, H. 0ToBEleg; 1早, Haemida,5. V.2003, H. 0TOBEleg.

Distribution. Ishigaki-jima Is., Iriomote-j ima Is.Thjs species is named in honor of Dr. S. 0HMoMo, who collected the holotype of the pre-

sent new species.

118 Katsumi AKITA and Kimio MAsUMoTo

Borboresthes nakanel sp n o v.

[Japanese name: Nakane-tobiiro-kuchikimushiJ(Figs 6,12, 18, 24)

Body elongated-elliptical, rather strongly convex dorsad; dark reddish brown to dark yel-lowish brown, apical part of head, mouth parts, antennae and legs brownish yellow, hairs ondorsal surface dusky yellow with feeble brownish tinge; head, pronotum, antennae, major ven-tral parts and legs genty shining, scutellum and elytra feebly sericeously shining; dorsal surfacedensely clothed with decumbent, rather long hairs; ventral surface sparsely clothed with recum-bent short hairs.

Head subtrapezoida1 and gently convex in middle, very weakly covered with isodiametricmicrosculpture, closely, somewhat umbilicately punctate and clothed with fine hairs; clypeussubquadrate, defined from frons by curved fronto-clypeal border, with anterior part produced,feebly narrowed anteriad and truncate in front; genae rather small, subtriangular, feebly pro-duced laterad, very weakly raised in middle, depressed in posterior parts before eyes, rugu1oso-punctulate in interior parts and impunctate in marginal parts; frons feebly convex, weaklyinclined anteriad; areas near eyes weakly depressed, shallowly grooved along eyes. Eyes trans-versely subreniform in dorsal view, gently convex exteriad, with interior parts narrowly inlaidinto head. Antennae 1iform, reaching basal t/3of elytra, ratio of the length of each segmentfrom base to apex: 0.24, 0.19, 0.46, 0.50, 0.40, 0.42, 0.42, 0.40, 0.40, 0.36, 0.42.

Pronotum subtrapezoida1 in dorsal view, very weakly covered with isodiametricmicrosculpture, very closely, rather umbilicately punctate, covered with recumbent, rather longhairs; apex roundly produced anteriad, almost wholly, finely rimmed; base wholly bordered andrimmed, weakly produced in medial part, feebly emarginate in front of scutellum, rather notice-ably sinuous and impressed on each side of the production; front angles rounded but hardly seenfrom above, hind angles subrectangular in dorsal view; sides steeply declined to lateral marginsin anterior parts, gently so in lateral margins, which are finely bordered; disc moderately con-vex, closely and somewhat umbilicate-punctate, each puncture with a recumbent long hair; thehairs in interior-medial parts being shorter and finer than those in anterior-lateral parts.Scutellum sublinguiform, feebly convex, feebly asperate, closely covered with fine hairs.

Elytra about 17 times as long as wide,3.5 times the length and 13 times the width ofpronotum, widest at basal t/3; dorsum rather strongly convex, highest at basal3/8; disc puncta-te-striate, the punctures in striae small, slightly ovate and closely set; intervals feebly convex,weakly covered with isodiametric microsculpture, rather closely scattered with small punctures,each with a minute protrusion at the anterior edge and a recumbent long hair, the hairs in interi_or-medial Parts bein9 shorter and finer than those in anterior-lateral paris; humeri weaklyswollen; apical parts rounded.

Terminal segment of maxillary palpi missing in the holotype. Ventral side of neck pol_iShed. P「oSte「num rugu1oso-punctulate, almost asperate; mesosternum rugu1oso_punctulate toW「inkled; metasternum scattered with punctures, each with a fine short hair. Abdomen closely,finely punctate, each with a fine short hair, basal and lateral parts of 1st to3rd sternjtes1ongjtu_dina11y wrinkled,5th male stemite weakly depressed in apical part, wjth rounded at apex

Legs moderate-sized and ordinary in shape in the members of this genus; pro_ and meso_ta「Si with3rd and4th segments rather noticeably dilated towards each apex, respectively, pro_ta「Si With3「d Segment largest, mesotarsi with4th segment largest, metatarsi with3rd segment

4(3)5(6)

IS

Male genitalia with basal piece not nalTowed in anterior 1/3Elytra with sutural parts lighter in color; fused parameres elongate, about20% the wholelength of genitalia. Body length:7.0-7.5 mm. Amami-oshima Is., 0kinoerabu-j ima Is. - -

58

67

Bo'bo1-est/1es from the Ryukyu Islands l l 9

a o/momol sp nov

gently widened; ratios of lengths of pro-, meso- and metatarsal segments: 0.2g, 0.18, 0.20, 0.24,0.40; 0.43, 0.19,0.20, 0.25, 0.45; 0.80, 0 . 28, 0.30, 0.38.

Male genitalia extremely elongated fusiform, about 16 mm in length and 0.25 mm jnwidth, weakly curved in lateral view; basal piece gradually narrowed towards the border ofParameres; fused parameres elongated subtriangular in dorsal view, gently weakly ventrad,0.24mm in length, subnib-shaped.

Body length: 6.2-7.4 mm.Type series. Ho1otype. 1 , Ishigaki-j ima Is., Kabira, 13. V. 1973, T. NAKANE leg.

(NSMT-I-C42973). Paratypes. Ishigaki-jima Is: 1 早, same data as the holotype(NsMT_I_c42971);2早早, ditto, 23. V 2001, T. SHIMADA leg;1 , Mt. Buzama-dake, 17. IV. 1998, S.OhmOm01eg; 1 , Yonehara, 26. V 2001, T. SHIMADA leg ; 1 , dittO, 23. V 2003, J.OKAMURA leg ; 1 ,1 早, dittO,6-9. V 2004, H. 0ToBEleg ;1 (j1、, dittO,3. V 2005, H. 0ToBEleg;1 (11、, ditto,7. V.1993, K. AKITA leg; 1 早, Yoshihara,4-5. V.1994, H. 0ToBEleg;Iriomote-j ima Is ;1 早, Haemida, 5. V 2003, H. 0ToBEleg; 1 早, Hoshinosuna Camp sjte,16- 17. V 2001, T. SHIMADA leg.

Distribution. Ishigaki-j ima Is., Iriomote-j ima Is.The specific name is dedicated to the late Dr. T. NAKANE, who studied the A11eculinae of

the Ryukyu Islands, and collected the type materials of the present new species.

Key to the Species of the Genus Borboresthes from the Ryukyu Islands

1(2) Antennae slender, reaching beyond the middle of body length in male, or about the half ofthe same in female. Male genitalia with basal piece strongly curved in middle in lateralview; parameres very long, about28% the whole length of genitalia. Body length:8.2-9.5mm. Ishigaki-jima Is., lriomote-jima Is. - - - - Bo1-boresthes kabi rensis MAEDA et NAKAE

2(1) Antennae not beyond the middle of body length even in male. Male genitalia with basalpiece weakly curved in lateral view; fused parameres less than20% the whole length ofmale genitalia

3(4) Male genitalia with basal piece prolonged and narrowed in anterior l/3; fused parameressublinguiform in dorsal view. Body length: 7.9-9.3 mm. Ishigaki-j ima Is., Iriomote-jima

Elytra wholly dark brown to dark grayish brown; fusedwhole length of genitalia

B amamianus MAEDA et NAKANE

parameres short, less than t7% the7

pronotum and elytra dark grayish brown. Male genitalia with basal piece bold in majorbasal part, rather strongly narrowed anteriad; fused parameres somewhat nib-shaped,about 17% whole length of genitalia. Body length: 7.2-8.6 mm. Amami-oshima IS.,Takara-j ima Is a /1iralf sp nov

8(7) pronotum and elytra dark reddish brown to dark yellowish brown. Male genitalia eton9at-ed fusjform, with basal pieces not strongly narrowed anteriad; fused paramereS about 10-12% the whole length of genitalia 9

120 K atsumi AKITA and Kimio MAsUMOT0

9(10)Male genitalia elongated fusiform, fused parameres long, about 12% the whole length ofgenitalia, somewhat nib-shaped. Bodylength: 7.0-7.6 mm. Tarama-j ima Is

要 約

秋田勝己・ 益本仁雄: 日本産ゴミムシダマシ科甲虫の新種・ 稀少種 (第7 報) ・ 琉球列島産 トビイロクチキムシ属 ( ゴミムシダマシ科クチキムシ亜科) の再検討. 一 琉球列島産トビイロクチキムシ属Borboresthesは, これまで西表島からB fuliginosus FAIRMAIRE,1897 ミナミトビイロクチキムシ (ヵバイロクチキムシ) (MlwA, l933), 奄美大島からB amamianus MAEDA etNAKANE, 1988 アマミトビイロクチキムシ, 石垣島からB kabirensis MAEDA et NAKANE, 1988イシガキトビイロクチキムシが知られている. このうち, .a fuliginosusは中国・ 四川省のものであることから, 同定間違いであると考えられる.著者らは, 今回, 琉球列島産の本属の種を再検討し, MAEDE et NAKANE(1988) の2 種のほかに4 新種を見出したので, B hirali sp nov. ヒライトビイロクチキムシ (奄美大島, 宝島), Bkimurai sp nov. タラマトビイロクチキムシ(多良間島), B ohmomoi sp nov. オオモモトビイロクチキムシ(石垣島, 西表島), B nakanei sp nov. ナカネトビイロクチキムシ (石垣島, 西表島) として命名記載し, これに全6種の検索表を付した. また, 沖永良部島からB amam1-anusを, 西表島からB kablrensisを記録した.

References

10(9) Male genitalia extremely elongated fusiform, fused parameres short, about 10% the wholelength of genitalia, elongated subtriangular. Body length: 6.2-7.4 mm. Ishigaki-jima Is.,Iriomote-j ima Is

a zmurai sp nov

B nakanei sp nov

AZUMA, S. (ed ), S. AZUMA, M. YAFUS0, M. KINJ0, M. HAYASH1, T. KOHAMA, T. SASAKI, M. KIMURA. & F.KAwAMuRA, 2002. Check List of the Insect of the Ryukyu Islands (Second Edition), the BiologicalSociety of Okinawa, Nishihara,Okinawa, xxiv+570 pp. (In Japanese, with English book title)

FAIRMAIRE, L., 1897. Coleopteres du Sze-tchouen et de Koui-Tcheou (China). Notes from the LeydenMuseum,19: 241-255.

KIMOTo, T.,2004. Distribution Records of A11eculinae. Coleopterists' News, (145):7- l4. (In Japanese)MAEDA, M& T. NAKANE, l988. New or Little-known Coleoptera from Japan. Review of Miyazaki

Sangyo-keieiUniverslty,1(1): 1-10.MIYATAKE, M., l985. A11eculidae. In: KUROSAWA, Y et al. (eds), The Coleoptera of Japan in Color, 3:

346-348 [incl. pl 59]. Hoikusha,Osaka. (In Japanese, with English book lille)MIWA, Y.,1933. An enumeration of Coleoptera from the island I1iomote in Loochoo, with descrjptjons of

new Species(The Coleopteran fauna of Loochoo, I). Transection of theNaturalHistory society ofFormosa, 23: 4-11 .

SASAJl, H・,1989. A11eCulidae. In:: HIRASHIMA, Y., eta1. (eds). A Check List of Japanese Insects[1]:418_419. Kyushu University. (In Japanese with English book tjlle)

(Received October 10, 2008; Accepted October24,2008)