192 E. E. SNODGKASS. 



anterior edge of the vertical rod, at about its middle, is a large tri- 

 angular scapula like apodeme (fig. 15, ap.). Only the posterior 

 narrow neck of this plate projects into the genital chamber. The 

 whole structure can be regarded as a bifid rod arising from an apo- 

 deme, which is the common form of the second gon apophyses in the 

 genera so far described. 



A short, cylindrical anal tube is present. 



Genus ERIOCER4 Macq. 

 This genus closely resembles Limnopliila in the structure of the 

 hypopygium. It is here described because it represents the small 

 group Anisomeriua, Osten Sacken's Section V. 



Eriocera eriophora Wils. 



The body of the hypopygium is a simple ring, widest on the sides, 

 very narrow below, constricted above by a posterior emargination. 

 The pleura are large, almost cylindrical lobes, appendicular^ attached 

 to the rim of the hypopygium. Each bears distally two long, curved 

 apical appendages directed forward and inward. The convex border 

 of the anterior appendage fits into the concave border of the poste- 

 rior, giving to the two a beak-like appearance. 



Genus AMALOP1S Haliday. 



This genus may be taken as representative of the group Amalopina. 

 In it the pleura attain their best development as appendages of the 

 rest of the hypopygium. That is, their appendicular condition is 

 most pronounced, and the apical appendages proper are reduced to 

 small processes and hooks. 

 Amalopis cons&aiis Doane (PI. IX. figs. 24, 26, 31, 32). 



The abdomen posteriorly is somewhat tapering. The hypopygium 

 forms a small but abrupt globular enlargement (fig. 32). The ter- 

 gum of the eighth segment is larger than the sternum. 



The hypopygium has the tergum separated by sutures from the 

 sternum. The former is a simple plate with the posterior border 

 gently convex, and slightly notched medially (fig. 26). The sternal 

 margin is medially produced into two small knobs (fig. 24). The 

 pleural are large, thick and subcylindrical (fig. 32). Each is strongly 

 chitinous and very convex on the outer surface, but presents a large 

 irregular, median, non chitinous area on the inner surface (fig. 31). 

 The distal end is produced into a long median finger-like process, 



