THE FLEAS OF XORTH AMERICA 37 



311 the movable finger, the upper being acutely pointed apically and 

 the lower rounded apically. 



Opisodasys keeni (Baker) 



(Fig. 7, B) 



Pulex keeni Baker, 1896, Canad. Ent. 28: 234. 



Ceratophylius keeni Baker, 1904, U. S. Natl. Mus. Proc. 27: 400, pi. 15, figs. 7-12. 



Opisodasys keeni Jordan, 1933, Novitates Zool. 39: 72. 



Type host. — Peromyscus maniculatus keeni (Rhoads) (white- 

 footed mouse). 



Type locality. — Queen Charlotte Islands, British Columbia. 



Range. — Western part of the United States and Canada. 



In this species the frontal tubercule and notch are either vestigial 

 or absent. When vestigial they are easily overlooked. 



Opisodasys pseudarctomys (Baker) 



Ceratophylius pseudarctomys Baker. 1904, U. S. Natl. Mus. Proe. 27: 399, 



pi. 24, figs. 1-7. 

 Ceratophylius acosti Rothschild, 1S05, Novitates .Zool. 12: 168, pi. 7, figs. 19 



and 20. 

 Opisodasys pseudarctomys Jordan, 1933, Novitates Zool. 39: 72. 



Type host. — Marmot a monax (L.) (woodchuck). 



Type locality. — Newport, Herkimer County, N. Y. 



Range. — United States and Canada. 



Baker's description of this common and well-known flea is accom- 

 panied by seven drawings, one being of the head of the male and 

 one the head of the female. The movable finger of the clasper in 

 p8t udarctomys is striking in appearance and identifies the species. It 

 is roughly sickle-shaped, with a long, stout, backwardly curved, 

 blunt-pointed, apical, spinelike seta, and two short setae on the lower 

 extremity, the upper being sharply pointed and the lower stout and 

 rounded at the tip. 



I. Fox {20. p. 57) has recently redescribed pseudarctomys. 



Opisodasys robustus (Jordan) 



Ceratophylius robustus Jordan, 1925, Novitates Zool. 32: 105, fig. 18. 



Opisodasys robustus Jordan. 1933, Novitates Zool. 39: 72. 



Opisodasys spatiosus I. Fox, 1940, Wash. Ent, Soc. Proc. 42: 65, pi. 10, fig. 2. 



Type host. — Unknown. 



Type locality. — White River. Cooley, Ariz. 



Range. — Southwestern part of the United States. 



The original description of this species was based entirely on the 

 female. The male was described in 1939 by Jordan (45, p. 316), 

 who examined specimens taken in the Catalina Mountains, Ariz., on 

 Si iuruB arisonensis catalina. 



Opisodasys vesperalis (Jordan) 



Ceratophylius vesperalis Jordan, 1929, Novitates Zool. 35: 28, pi. 1, figs. 1 and 2. 

 Opisodasys vesperalis Jordan, 1933, Novitates Zool. 39 : 72. 



Type host. — Glaucomys uibmnus alpinus (Rich.) (flying squirrel). 

 Cotype localities. — "Okanagan and Okanagan Landing," British 

 Columbia. 



