62 MISC. PUBLICATION 5 00, U. S. DEPT. OF AGRICULTURE 



from East Greenland and the host is questioned. According to 

 Wahlgren's figure of the clasper, its dorsal process is peculiar in 

 that it is bent or hooked backward at its apex. 



Trichopsylla (Trichopsylla) immitis (Jordan), new combination 



Ceratophyllus immitis Jordan, 1029, Novitates Zool. 35: 33. pi. 1, fig. 13. 



Type host. — "Lemming." 



Type locality. — Canada. 



Range. — Known only from Canada. 



The original description of immitis was based on the female. The 

 species is said to be nearest acerba (Jordan), but: "Sinus of VII 

 st. much shallower, the lower lobe hardly at all projecting." 



Trichopsylla (Trichopsylla) jordani (I. Fox), new combination 



Malaraeus jordani I. Fox, 1930, Iowa State Col. Jour. Sci. 13: 335, pi. 1, 

 fig. 2. 



Type host. — "Peromyscus" (white-footed mouse). 



Type locality. — Cerro Potosi, Nuevo Leon, Mexico. 



Range. — Known only from the type locality. 



The original description of joi'dani was based on a single male and 

 is accompanied by a drawing of the clasper. The species is separated 

 from its congeners by the details of the terminalia. 



Trichopsylla (Trichopsylla) lucifer (Rothschild), new combination 



CeratopJiyllus lucifer Rothschild, 1905, Novitates Zool. 12: 170, pi. 6. fig. 12. 



Type host. — Microtvs drummondii (And. and Bach.) (meadow 

 mouse). 



Type locality. — Red Deer, Alberta. 



Range. — Western Canada. 



The original description of lucifer was based on two female speci- 

 mens. According to this description and the figure which accom- 

 panies it, the eighth tergal plate bears two stout, spinelike setae near 

 apex. 



Trichopsylla (Trichopsylla) megacolpa (Jordan), new combination 



Ceratophyllus megacolpus Jordan, 1929, Novitates Zool. 35 : 33. pi. 1, fig. 12. 



Type host. — Microtm drummondii (Aud. and Bach.) (meadow 

 mouse). 



Type locality. — Okanagan Landing, British Columbia. 



Range. — Known only from British Columbia. 



The original description of this species was based on a single 

 female in the United States National Museum. The species is iden- 

 tified by the shape and size of the emargination or sinus of sternal 

 plate VII of the female. This sinus is very large and makes an 

 almost perfect semicircle, which in diameter is equal to about twice 

 the width of the lobe above it. 



