NEW M ALLOT HAG A. 107 



and the common chitinous base are entirely exposed. 

 It is to be noted tliat in this species the lateral processes 

 of the external penis are not, as in Docojt/torHs, Xirnms, 

 and Giehdin, movably articulated to the base, and 

 also that the nu'dian part is much less extensively 

 chitini/x'd. 



Lipeurus fuliginosus major. (Plate XIV, fig. 1). 



ill this species the chitinous genital parts form a 

 fork-shaped structure. A long, narrow plate lies within 

 the body, representing the handle, while the external 

 part consists of two prongs. The internal plate is com- 

 paratively much narrower than in any of the species so 

 far described. It is a little contracted from side to side 

 toward its base. Distally it gradually tapers to a blunt 

 termination. Its posterior end expands suddenly and 

 becomes bifid. Each arm is very short and extends 

 backwards and outward, forming an angle of about 45'"^ 

 with the plate. The posterior Vjorders of the two form 

 a concavely rounded edge to their end of the plat«. 

 Attached to the posterior end of each of these prongs is 

 a lengthened knife-like piece which extends backwards 

 into the genital cavity. The two are dissimilar. The 

 one on the left is larger, being both longer and wider, 

 but they differ in still other respects. The left one has 

 its outer edge convex proximally and concave distally; 

 the inner edge of the same shows similar curves but 

 in opposite order. The end tapers down to a point 

 directed somewhat outwards. The outer edge of the 

 right smaller prong has an outline corresponding with 

 that of the inner edge of the left prong. That is, it is 

 concave toward its base and convex toward its tip. The 

 inner edge is convex at the middle, decidedlv concave 

 proximally an<l slightly so distally. Hence its point is 



