THE FLEAS OF NORTH AMERICA 45 



Thrassis acamantis (Rothschild) 



(Fig. 7, A) 



CeratophyUus acamantis Rothschild, 1905, Novitates Zool. 1- : 156, pi. 8, 



figs. 24 and 25. 

 Thrassis acamantis Jordan. 1933, Novitates Zool. 39: 72. 



Gotype hosts. — Mephitis occidental is spissigrada (Bangs) (skunk), 

 Marmot a flaviventris (And. and Bach.) (woodchuek) , Mustela vison 

 energunienos (Bangs) (weasel) , Ganis latrans Say (coyote). 



Gotypi localities. — Okariagan, Sumas, and Eagle River. British 

 Columbia. 



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



This widely distributed species is of medium size and has marmots 

 for natural hosts. In it the posterior process of the ninth sternal 

 plate of the male bears near the ventral margin of its proximal lobe 

 a pair of long. flat, apically acuminate, modified, pigmented spines, 

 the shape of which is characteristic of the species. 



Thrassis arizonensis arizonensis (Baker) 



Fulc.r arizonensis Baker, 1888, N. Y. Ent. Soc. Jour. 0: 55. 



CeratophyUus proximus Baker. 1904, D. S. Natl. Mus. Proc. 27: 412, pi. 19, 



figs. 1-.). 



Thassis arizonensis Jordan. 1933, Novitates Zool. 39: 73. 



Type host. — '"Nest of silvery mouse.** 

 Type locality. — Tucson. Ariz. 

 Range. — Western part of the United States. 



The original description of the species arizonensis was based upon 

 a single male and unaccompanied by figures. 



Thrassis arizonensis littoris (Jordan) 



CeratophyUus arizonensis littoris Jordan. 1929, Novitates Zool. 35: 31, pi. 1, 



fig. <i 



Type host. — "( itellus turdicaudatus" (ground squirrel). 



Type locality. — San Diego. Calif. 



Range. — Known only from California. 



The original description of littoris is based upon a single female 

 which is like the type subspecies. u but the ventral, widened area of 

 tergite VIII with 21 bristles on one side and 20 on the other, in- 

 stead of from 14 to 1G as in C. a. arizonensis." 



Thrassis bacchi (Rothschild) 



CeratophyUus bacchi Rothschild, 1905. Novitates Zool. 12: 159, pi. 9, fig. 34. 

 Thrassis bacchi Jordan, 1933, Novitates Zool. 39: 73. 



Type host. — Citellus tridecemlineatus (Mitch.) (13-striped ground 

 squirrel). 



Type locality — Red Deer. Alberta. 



Range — Western part of the United States and Canada. 



The original description of this species, based exclusively on the 

 male, is accompanied by drawings of the terminalia. 



