244 GRAMMAR OF ENTOMOLOGY. 



ease, swiftness, and elegance; cannot crawl on 

 aquatic plants like the preceding. Naucoris, 

 Notonecta, Corixa, Sigara. 



799. Frog-hoppers (Cicadiles). Antennae very 

 short, scarcely projecting beyond the head ; fore- 

 wings coriaceous, meeting with a straight suture ; 

 hind-wings membranaceous ; hind-legs incras- 

 sated, formed for leaping ; tarsi three-jointed : 

 most of the genera leap readily, but fly badly. 

 Inhabit vegetables, on the sap of which they 

 feed. Cicada, Cercopis, Memhracis, Psylla, 

 &c. 



800. Gall-insects {Coccites). Antennas hirsute, 

 long, moniliform, many-jointed ; fore-wings semi- 

 coriaceous, of uniform substance ; hind-wings 

 wanting, or replaced by appendages similar to 

 the halteres of Diptera ; legs of uniform structure, 

 not formed for leaping ; tarsi two- or three-jointed 

 in the male, with a single joint in the female ; tail 

 furnished with two long setee. The females are 

 apterous, and attach themselves to the bark and 

 leaves of trees, on which they deposit their eggs, 

 covering them with their bodies. Coccus. 



801. Plant-lice {Aphites). Antennse con- 

 spicuous, elongate, seven-jointed ; fore-wings 

 deflexed, meeting over the back with a straight 

 suture ; hind-wings much smaller and shorter ; 

 all the wings membranaceous ; legs of uniform 

 structure, not formed for leaping ; tarsi two- 

 ointed. Infest all vegetables, sucking the sap : 



