THE FLEAS OF NORTH AMERICA 47 



Type locality. — Vernal, Utah. 



Range. — Known only from Utah. 



Very similar to type variety but : "Exopodite F [movable finger] 

 a little broader than in C. g. gladiolis; anterior angle of paramere 

 slightly less projecting * * * ." 



Thrassis howelli howelli (Jordan) 



Ceratophyllus howelli Jordan, 1925, Novitates Zool. 32: 109, figs. 34 and 35. 

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



Cotype hosts. — Mustela arizonensis (Mearns) (weasel) and Mar- 

 mota fiaviventris sierrae How. (woodchuck). 



Type locality. — Pine City, Mono County, Calif. 



Range. — For the species as a whole, western part of the United 

 States; for this particular subspecies, California only. 



Thrassis howelli is near acamantis Rothschild, but sternal plate 

 VIII (a figure of which accompanies the original description) is 

 much more slender than in the latter species. The receptaculum 

 seminis is as in acamantis. 



Thrassis howelli utahensis Wagner 



Thrassis howelli utahensis Wagner, 1936, Ztschr. f. Parasitenk. 8: 340, fig. 12. 



Type host. — Marmota flaviventris engelhardti (Allen) and M. f. 

 nosopho/a How. (woodchucks). 



Cotype localities. — Salina and Logan, Utah. 



Range. — Utah. 



This subspecies is said by its author to unite Thrassis howelli 

 Jordan with T. acamantis Rothschild. Drawings of the eighth ster- 

 num and tergum of the male accompany the original description. 



Thrassis pandorae Jellison 



Thrassis pandorae Jellison, 1937, U. S. Pub. Health Serv. Rpts. 52: 727, figs. 1, 

 2, and 4. 



Cotype host. — Citellus elegans (Kenn.) (ground squirrel). 



Type locality. — P. and O. Ranch, Beayerhead County, Mont. 



Range. — Known only from Montana. 



In this species the posterior process of the ninth sternal plate of 

 the male has, in addition to the usual two yentral lobes, a third 

 ventral lobe which is situated at its base. The basal lobe is flattened, 

 subdiscoidal, and without setae. The receptaculum seminis has a 

 broadly oval, somewhat asymmetrical head and a button on the apex 

 of the tail. 



Thrassis pansus (Jordan) 



Ceratophyllus pansus Jordan, 1925, Novitates Zool. 32: 109, fig. 38. 

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



Type hosts. — Citellus sp. (ground squirrel) and Mephitis sp. 

 (skunk). 



Type locality. — Paradise, Ariz. 



Range. — Known only from Arizona. 



The original description of this species, which is accompanied by 

 a drawing of the distal end of the penis, is based exclusively on the 

 male. 



