48 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 94 



sexes. The genitalia of the female (fig. qB.C) are comparatively 

 slight modifications of the ninth and tenth segments. The tergite of 

 the ninth segment (tt. g) is the sclerite termed the proctiger by Tanner 

 (1927). The anus (mi) is borne not at the end of this sclerite but 

 on another lobe beneath this, the dorsal surface of which represents 

 the tenth tergite. The homology of the pair of elongate lobes, called 

 paraprocts by Tanner, which lie along the sides of the true " proctiger " 

 or tenth segment, are not known. They most likely are parts of the 

 ninth tergum which have become separated from the tergite. The 

 sternum of the ninth segment is represented in the two rectangular 

 sclerites (vlf) meeting along the midline and called the valvifers by 

 Tanner. These bear a pair of two-segmented appendages composed 

 of a basal coxite (cxt) and a stylus (sty). This interpretation differs 

 somewhat from that of Tanner, as he considered the valvifers to be 

 the basal segment of the appendages of the ninth segment. The open- 

 ing of the vulva (vul) is behind (entad) and between the apices of 

 the sternal plates. The distal portions of the ninth tergite and the 

 lateral lobes, the valvifers, the coxites, and the styli are clothed with 

 rather long but pale setae. The surface of the membrane about the 

 vulva is finely muricate with rather blunt pustules. 



The genitalia of the male (fig. 9 G) are much more highly special- 

 ized or modified than those of the female in this species. The several 

 sclerites caudad of the eighth segment of the abdomen but not ac- 

 tually forming part of the aedeagus have not heretofore been con- 

 sidered as part of the male genitalia. Since they correspond rather 

 closely to the parts of the ninth segment in the female, they are here 

 included with the genitalia of the male. 



The ninth segment appears to be present as four distinct parts. The 

 median dorsal surface (fig. 9 A, tt. p) is almost entirely unsclerotized 

 but bears numerous setae. This area is assumed to represent the ninth 

 tergite. On each side is an elongate lobe (vl), heavily sclerotized and 

 densely clothed with setae, which is interpreted as the appendage of 

 the ninth segment, the valvula. The sternum is occupied by a sagit- 

 tate sclerite (s. 9) which is undoubtedly the ninth sternite. It is densely 

 clothed with setae similarly to the valvulae and the eighth sternite. 



The male genital tube consists of a strong median lobe and a pair of 

 united lateral lobes. The median lobe (fig. 9 G, nil) has a large bulbous 

 base and bears the median orifice (1110) at its distal end. On the 

 ventral side at the junction of the bulbous part and the distal tube 

 is the small median foramen (nif) through which passes the ejacu- 

 latory duct (ej). This duct opens to the exterior through the tip of 

 the flagellum (//), which is somewhat coiled and apparently double 



