NORTH AMERICAN ACROLOPHIDAE — HASBROUCK 561 



Aedeagus approximately three-fifths as long as harpe, considerably 

 flattened dorsoventrad, sublinear in dorsal and ventral aspects, ap- 

 proximate apical third cm^ving somewhat ventrad in lateral aspect, 

 asymmetrical in aU aspects, glabrous, base broadly and irregularly 

 expanded laterad and ventrad, basal half tubular, apical half opening 

 broadly and irregularly dextrad; apical portion consisting simply of 

 one or two, elongate, slender, moderately sclerotized, dorsosinistral 

 strips terminating acutely or subacutely. 



Vesica large, membranous, armed with two prominent clusters of 

 cornuti: cornuti variously sized, mostly large, heavily sclerotized and 

 darkened, linear, with apices finely acute; basal cluster largest, located 

 dorsodextrad near base of vesica, containing 4-13 cornuti; apical 

 cluster smaller, located dextrad nearer apex of vesica, containing 2-8 

 cornuti. The number of cornuti in each cluster varies from specimen 

 to specimen and thus constitutes the chief intraspecific variation to be 

 found in the genitaha of this species (see the tabulation, below, for 

 examples of this variation). 



In the & genitalia of all the individuals of popeanellus that have 

 been examined, the presence of two distinct clusters of cornuti in the 

 vesica has proved to be a consistent and positive specific character. 

 However, these cornuti commonly vary in size and number between 

 the two clusters of any one individual as well as between the corre- 

 sponding clusters of any two individuals. Thus, they furnish a good 

 example of an intergrading, intraspecific variation in regard to theu- 

 sizes, numbers, and ratios between the basal and apical gi'oups. This 

 variation is illustrated by a samphng of 18 specimens listed in the 

 following table. 



Table 1. — Intraspecific variation of cornuti in A. popeanellus 



Cornuti 



