(Coleos = sheeth & pteron = wing)
E.g. Beetles and Weevils
Some insects are predators or scavengers; many are crop pests while some are destructive to stored grains.
1. Minute large insects.
2. Fore wings modified into horny or leathery elytra which meet to form a mid-dorsal line, fore wings not used in flight.
3. Hind wings membranous, folded beneath the elytra or often reduced or wanting.
4. Mouth parts mandibulate.
5. Prothorax large and mobile, mesothorax reduced.
6. Abdominal tergiles often sclerotized.
7. Larvae campodaidorm or crucidorm, seldom apodous with mandibulate mouth part.
8. Pupal adecticous and exarate, rarely obtect.
9. Metamorphosis complete.
The order is divided into four sub-orders viz.
Archostemata, Myxophaga, Adephaga and Polyphaga Larvae of the insect belonging to sub-order Archostemata are wood feeders while the insect from sub-order Myxophaga are found in wet places by streams Comparative characters of the later two sub-orders are as follows:-
i. Cicindelidae e.g. Tiger beetle
ii. Dytiscidae e.g. Water beetle
iii. Carabidae e.g. Ground beetle
1) Notopleural sulcus never distinct in Prothorax
i. Meloidae e.g. Blister beetle
ii. Coccinellidae e.g. Lady bird beetle, Epilachna beetle
iii. Scarabaeidae e.g. White grub
iv. Cerambycidae e.g. Mango stem borer, Grape stem girdler
v. Chrysomelidae e.g. Rice hispa
vi. Bruchidae e.g. Pulse beetle
vii. Tenebrionidae e.g. Rust red flour beetle
viii. Dermestidae e.g. Carpel beetle, Khapra beetle
ix. Cucujidae e.g. Saw toothed grain beetle
x. Bostrychidae e.g. Lesser grain borer
xi.Melolonthidae e.g. Cockchafer beetle
xii.Dynastidae e.g. Rhinoceros beetle
xiii. Curculionidae e.g. Weevils