ZOOL.-VOL. III.] SNODGRASS—DOLICHOPODID HYPOPYGIUM. 28$ 



roof of the genital chamber. It curves downward and 

 posteriorly, resting upon the floor of the genital chamber 

 anteriorly; but posteriorly it curves upward and extends 

 far beyond the end of the hypopygium (fig. i,jf>). It is 

 embraced by the two posterior clasping appendages {a) 

 of the hypopygium. There is no sheath for the penis; the 

 floor of the genital chamber projects backward beneath it 

 in a small median point. 



The eighth segment (fig. i, viii) is circular, thin, and 

 scale-like, lying upon the ninth in the ordinary position. 



The tenth segment is inclosed within the posterior upper 

 part of the genital chamber, the distal parts of the paranal 

 lobes alone projecting (fig. i, x). 



Stanford University, 

 California. 



