40 BRUCE F. CUMMJNGS — NONDESCRIPT ANOPLURA AND MALLOPHAGA. 



and occur principally on Marsupials, the new genus is from Paraguay, and was 

 taken on Cavia aperea. It is a robust, spiny insect, with large, prothoracic 

 " wings," recalling Trincton, just as Heterodoxus stands close to Menopon. 



The genus is distinguished not only by the prothoracic " wings," but by the 

 form of the $ genitalia and by the proportional lengths, the head and thorax 

 together being almost as long as the abdomen. 



Trimenopon echinoderma, sp. nov. (fig. 4). 



Head similar to that of Menopon^ broader than long. Premaxillary area 

 semicircular ; behind the maxillae the lateral margins curve outwards in a bend 

 and continue to diverge as far as the postero-lateral angles, which are acute ; 



a 



Fig. 4. — Trimenopon echinoderma, Cummings, 9 '■> a , the gastric teeth ; 



b, £ sexual apparatus. 



occipital margin more or less straight. Two rows of hairs run longitudinally 

 over the dorsal surface of the head : in front of each temporal fossa on 

 the dorsal surface is a powerful spine ; a transverse row of small hairs in 

 front, at the level of the maxillary palpi, the two outer ones being on the 

 extreme margin. Several spines along the lateral margins of the head, and on 

 the postero-lateral corners stands a group of very stout spines, one being excep- 

 tionally long. Under surface of the head with a raised central area ; at the 

 postero-lateral angles of this a long bristle and three short ones in line in front 



