Mandibles are bent, expanded, leaf like and visible from above.
Horns are usually present in male in the head and thorax.
Coconut rhinoceros beetle:
Oryctes rhinoceros . Cephalic horns are found in both the
sexes. In male the horn is longer and recurved. In female it is shorter and straight. Adults
are injurious to coconut and grubs are found in dying palms and manure pits.
8. ELATERIDAE(Click beetles, Wire worms)
Body is elongate and cylindrical.
Pronotum is rounded anteriorly and its posterior corners are sharply pointed.
Adult is able to jump and land upon its feet while lying on its back. Each jump is
accompanied by an audible clicking sound. Movement of prothorax makes the prosternal
spine to slip into the mesosternal cavity. This causes the elytra to press against the
surface and propel the
beetle into air.
Eggs
are
laid
in
soil.Grubs are long,
Insect Morphology and Systematics
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cylindrical and tough skinned and called wireworms. They feed on roots.
