Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

1. Silverfish/Lepismatidae/Thysanura

Cerci

Median caudal filament

Fig. Silverfish

Body covered with silvary scales.Last abdominal segment bears a pair of cerci and a median caudal

filament.Antenna long and filiform.

Filiform antenna

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

2. Dragonfly/Aeshnidae/Odonata Eye contagious

Fig. Dragonfly

Body stout and robust. Wings dissimilar, i.e. the base of the hind wings are broader than the base of the fore wings.

Wings held horizontally when at rest. Compound eyes larger and contagious.Stigma present at apex of the each wing.

Base of the hind wing broader than the base of the front wing

Wings dissimilar

Stigma present

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

3. Damselfly/Coenagrionidae/Odonata

Body slender.Both wings similar. Compound eyes larger but separated. Stigma present on each wing.

Eyes separate

Fig. Damselfly

Both wings similar

Body slender

Stigma present

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

4. Short horned grasshopper/Acrididae/Orthoptera

Hind leg jumping type

Fig. Short horned grasshopper

Body stout and robust. Wings dissimilar, i.e. the base of the hind wings are broader than the base of the fore wings.

Wings held horizontally when at rest. Compound eyes larger and contagious.Stigma present at apex of the each wing.

Wings: tegminaFilliform antenna

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

5. Long horned grasshopper/Tettigoniidae/Orthoptera

Fig. Long horned grasshopper

Antenna longer than body and and filiform.Ovipositor sharp, flattened and blade like structure.Hind leg jumping type and tarsi 4 segmented.

Ovipositor blade like

Antenna longerThan the body

Wings tegmina

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

6. Field Cricket/Gryllidae/Orthoptera

Fig. Field cricket

Body large dull, usually pale, brownish or black in color.Ovipositor long needle like.A pair of unsegmented cerci present.Fore wings modified into tegmina.Hind leg jumping type.

Ovipositor needle like

Dull, pale colored body

Wings tegmina

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

7. Mole Cricket/Gryllotalpidae/Orthoptera

Fig. Mole cricket

Robust body.Ovipositor short and vestigial.Front leg greatly enlarged and modified for digging.A pair of long unsegmented cerci present.Fore wings modified into tegmina

Ovipositor vestigialWings tegmina

Front leg digging type

Robust body

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

8. Earwig/Forficulidae/Dermaptera

Cerci modified into Forcep like structure

Fig. Earwig

Cerci modified into forcep like structure.Fore wings short, modified into tegmina and hind wings semi circular and folded beneath the tegmina.Antenna short and filiform.Tarsi 3 segmented.

Tegmina shortFilliform antenna

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

9. Cockroach/Blattidae/Dictyoptera

Body oval

Fig. Cockroach

Body oval, flattened, head partly or completely covered by the shield like pronotum.Antenna longer than the body filiform.Cursorial or walking and running type leg.Fore wings modified into tegmina, hind wings membranous.Mandibulate mouthparts, chewing type

Shield shaped pronotumFilliform antenna

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

10. Preying mantid/Mantidae/Dictyoptera

Pro thorax greatlyelongated

Fig. Preying mantid

Head movableProthorax greatly elongated.Fore leg raptorial type adapted for grasping prey.

Fore leg raptorialOr grasping type

Head movable

Sylhet Agricultural University

Department of

EntomologyChandra Kanta Dash (Assistant Professor)

11. Termite/Termitidae/Isoptera

Broad junction between Thorax and abodomen

Fig. Termite

Broad junction between thorax and abdomenAntenna moniliform, multisegmented.Workers with larger head and prominent mandible.Winged or wingless; winged formed with two pair of wings similar in size and shape, held flat over the adomen at rest.Mouthparts chewing type.

Antenna moniliform

Prominent mandible in worker

Wings similar when present