Novitates Zoological XXIII. 1916. 



129 



The dorsal processes of the 

 ninth tergite of the male (text- 

 fig. 6, P, dorsal view) are much 

 shorter and much broader than 

 in A. insulata, and apically 

 more tapering on the inner side 

 than on the outer. ' The valve (V) 

 is reduced to a narrow and 

 weak strip, presumably without 

 function, but covered with scal- 

 ing, as is the case with the 

 valve of the other species. The 

 harpe (H), on the other hand, is 

 very strongly developed, being 

 much larger than in insulata 

 and arravaca. Its shape is also 

 quite different, the apex being 

 divided into a sharply pointed 

 dorsal prong and an obtuse 

 ventral lobe. Themse apical pro- 

 jections are not quite the same 

 on the two sides of the body, 

 and also vary in the different 

 individuals. The Jharpes are so 

 long that their apfces are nearly 

 always visible without the scal- 

 ing being brushed aside. The 

 tenth tergite is pointed, as in 

 A. insulata. A v entral view of 

 the organs of eopulation (text- 

 fig. 7) reveals anot her distinction 

 of awrata. Below the short 

 funnel from whi ch the penis- 

 sheath (Pen) projects we find on 

 each side a strongly chitinised 

 short process not present in the 

 other species. The processes 

 are not alike, the , left one being 

 much larger and fmore regularly 

 curved and pointe d than the one 

 of the right-hand side. The tips 

 of both are direct ed towards the 

 left side. Above' them we find 



the 



cesses 



setiferous 

 (P 2 ) 



;laviform pro- 

 mentioned 



Test 



fig 



. 8.— 



9.— 



10.— 



Amma 



lo 



•insvlata. 

 arravaca 

 awrata. 



alres'idy 

 under A. insulatc.1. 



The structure of the eighth sternite of the female (text-fig. 10) is very dis- 

 tinctive. A semiiLcrescent-shaped, smooth, convex rim is formed around the orifice 

 of the vagina, thi'is wall being widened centrally, the widened portion corresponding 



