Like the perfect insects, they are predaceous, feeding on plant-lice (Aphidae) and scale insects (Coccidae).
In the Jurassic period many of the existing families, such as the Cicadidae, Fulgoridae, Aphidae, Nepidae, Reduviidae, Hydrometridae, Lygaeidae and Coreidae, had already become differentiated.
The two families to which special attention has been paid are the Aphidae or plant-lice (" green fly ") and the Coccidae or scale-insects.
Buckton's British Aphidae (London, Ray Society, 1875-1882); and R.
C, yov, leaf, and rjpos, dry), a genus of insects belonging to the family of Aphidae, or Plant-lice, in the Homopterous section of the order Hemiptera.