676 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



VOL. 49. 



There appears to be an unusual diversity of structure in the 

 posterior limbs of the males of this species, indicating indeed a plu- 

 rality of species. Some males seem to have the posterior femora 



Fig. 19.— Peistoceuthophilus pacificus. ITind leg of male type. 



unusually broad and heavy and armed with a single large tooth and 

 several minute serrations on both ventral margins, as in the type 

 specimen in the United States National Museum (fig. 19) ; others have 



Fig. 20.— Pristoceuthophilus pacificus. Hind leg of male in the Scudder collection. 



these femora heavy, as above, but armed only with small serrations 

 (fig. 20). A single male in the Scudder collection is the only one 

 with this type of femora seen, and it may prove to be a distinct species. 



Genus PHRIXOCNEMIS Scudder. 



Phrixocnemis Scudder, Proc. Amer. Acad. Arts Sci., vol. 30, 1894, p. 102. 



In this genus, the salient cha,racters of which are set forth quite 

 fully in the generic key, there are 10 species here included, 3 new 

 species, 1 transferred from the genus CeuthopMlus, 2 from UdeopsyUa,, 

 and 4 originally described in this genus, including P. tmculentits 

 Scudder, the designated genotype. 



