March, 1916] Homopterous Studies. Part I 169 



FAMILY CERCOPID^. 



This interesting family is characterized by the shape of the 

 hind tibice, which are cyHndrical and armed with two spines on 

 the outer side, one near the base, and the other a httle beyond 

 the middle, the former once and the latter twice as long as the 

 tibiae are wide. Tibiae and first two joints of the tarsi termi- 

 nated with a crescent-shaped row of spines, and the third joint 

 with a bifid claw. Frons usually tumid and convex or com- 

 presso-produced. Antennae inserted between the eyes. Two 

 ocelli located on the disc of vertex. Pronotum sixangular or 

 trapeziodal; scutellum triangular or rhomboidal. Elytra cor- 

 iaceous, more or less covered with a fine pubescence. 



The family comprises the well-known "Cuckoo-spit," 

 "Frog-hoppers," or "Spittle Insects," so called from the 

 frothy enveloping exudate in which the early history of the 

 insect is spent. The chief works on this family are those of 

 Walker, Stal, Distant, Schouteden and Jacobi. 



Table of Subfamilies of Cercopidae.* 



1. Anterior margin of the thorax straight, eyes equally as long as broad 



Cercopida Stal. 



2. Anterior margin of the thorax rounded or angular: eyes frequently transverse. 



Aphrophorida. Stal. 



SuBF. Cercopida Stal. 



Synopsis of Genera.* 



A. Front without a longitudinal carina. 



a. Front with a longitudinal sulcus Rhinaulax. A. & S. 



AA. Front with one or more than one longitudinal carina at middle. Front with 

 one carina. 



b. Carina weak, not well developed Locris. A. & S. 



Genus Rhinaulax A. & S. 



Head broad, the front convex and broadly flattened or 

 impressed from the middle of the base to beyond the middle of 

 the length. Ocelli remote from the eyes. Antennae three- 

 articulate, extending out almost from the sides of the head. 

 Thorax truncate before the base of the scutellum. Scutellum 

 equilateral. 



*Adapted from Stal. 



