The relation between ants and aphids has often been compared to that between men and milch cattle.
The lacewing-flies (q.v.), however, of which there are two families, the Hemerobiidae and Chrysopidae, whose larvae feed on Aphids, sucking their juices, are represented in our fauna.
Rtµc-, half and irmpov, a wing), the name applied in zoological classification to that order of the class Hexapoda (q.v.) which includes bugs, cicads, aphids and scaleinsects.
They feed entirely by suction, and the majority of the species pierce plant tissues and suck sap. The leaves of plants are for the most part the objects of attack, but many aphids and scale-insects pierce stems, and some go underground and feed on roots.
The enormous rate at which aphids multiply under favourable conditions makes them of the greatest economic importance, since the growth of immense numbers of the same kind of plant in close proximity - as in ordinary farm-crops - is especially advantageous to the insects that feed on them.