206 Annals Entomological Society of America [Vol. XV, 



MembracidcB 



One of the authors* has published notes on the development 

 of the genitalia of a membracid (Tricentus), In all its main 

 features it is similar to the Cercopidae. 



Cicadellidce . 



Observations on Eurymela and Deltocephalus mollipes also 

 show the same development as in the Cercopidee. 



CicadidcB 



No remarks are needed on the female genitalia, as they 

 are the same as in Cercopidae. 



In the male Cicadidae we have a very distinct type of geni- 

 talia. Although we have not followed the details of develop- 

 ment so thoroughly as in Cercopid^, yet enough is known to 

 clearly indicate the line of development and the homologies. 



In forms such as Pompomia maculaticollis the seventh 

 sternite is large and produced considerably posteriorly where 

 it is slightly emarginate in middle or broadly and slightly 

 bilobed. Whether this extension represents a development 

 of the seventh coxites we cannot say. The eighth sternite 

 forms a large plate which almost conceals the pygofer from 

 below. Posteriorly it narrows to a blunt point at apex, which 

 has a cleft in middle, thus making it bilobed. This represents 

 the eighth sternite and coxites and the eighth spiracles are 

 situated near its basal angles. The pygofer is large, its medio- 

 ventral surface membranous. From the lateral margins arise 

 a pair of non-articulated processes which represent the much 

 reduced g3. From the middle of the opening of the pygofer 

 arises, the asdeagus, which in most Cicadidae is long, thin and 

 tubular, but in some complex and trilobed. The anal segment 

 is similar in composition to that of the Cercopidae; in some 

 species it is complex. 



If our interpretation of the large plate below, or anterior 

 to, the pygofer, be correct, then it will represent a more 

 generalized type than the CercopidcC so far as this structure is 

 concerned; but the reduced and non-articulate genital style is a 

 specialization. The plate in question represents the hypandrium. 



*Kershaw, 1913, Ann. Soc. en Belgique, 57 (191-201). 



