432 INSECTA. 



FuLGORA, Lin. Oliv. 



Now variously subdivided. 



In the last of the Cicadarise, the antennse are inserted between the eyes; 

 they compose the genus 



CiCADELLA. 



Which is divided into Membrads, Tragopa, Darnis, 8cc. &c. 



FAMILY II. 



APHIDII. 



The second family of the homopterous Hemiptera, or the fourth 

 of the order, is distinguished from the preceding one by the tarsi, 

 which are composed of but two joints, and by the fiHform or setace- 

 ous antennae, which are longer than the head, and have from six to 

 eleven joints. 



Those individuals which are winged always have two elytra and 

 two wings. 



These Insects are very small; their body is usually soft, and their 

 elytra are nearly similar to the wings, or only differ from them in 

 being larger and somewhat thicker. They are astonishingly pro- 

 lific. 



Here the antennae are composed of from ten to eleven joints, the last of 

 which is terminated by two setse. 



They possess the faculty of leaping-, and form the genus 



PsYLLA, Geoff. — Chermes, Lin. 

 These Hemiptera, also called pseudo-aphides, or faux-pucerons, live on the 

 trees and plants from which they derive their nourishment; both sexes are 

 furnished with wings. Their larvae usually have a very flat body, broad 

 head, and the abdomen rounded posteriorly. Their legs are terminated by 

 a little membranous vesicle accompanied beneath with two hooks. Four 

 wide and flat pieces, wliich are the sheaths of the elytra and wings, 

 distinguish the nymph. Several in this state, as well as in the first, are 

 covered with a white substance resembling cotton, arranged in flakes. 



The remaining Aphidii have but six or eight joints in the antennae; 

 the last is not terminated by two setae. 



Sometimes the elytra and wings are linear, fringed with hairs, and 

 extended horizontally on the body, which is almost cyHndrical; the 



