50 MISC. PUBLICATION 5 0, U. S. DEPT. OF AGRICULTURE 



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



The original description of this species appears to be in error in 

 stating that the frontal tubercle is lacking. An examination of the 

 type specimens on which it is based shows that the male and female 

 each have a minute, angulate, almost hyaline frontal tubercle. 



Oropsylla (Oropsylla) rupestris (Jordan) 



Ceratopliyllus rupestris Jordan, 1929, Novitates Zool. 35 : 32, pi. 1, figs. 8 and 9. 

 Oropsylla rupestris Wagner, 1929, Konowia 8 : 314. 



Cotype hosts. — Mustela longicauda Bonap. (weasel) and Citellas 

 richardsonii (Sab.) (ground squirrel). 



Type locality. — Calgary, Alberta. 



Range. — Western Canada. 



According to the remarks given by Jordan accompanying the orig- 

 inal description, rupestris is similar to arctomys Baker, but smaller, 

 and "the bristles on the whole less numerous, the lowest bristle of the 

 posterior row of the abdominal tergite II posterior to the stigma, 

 not directly below it." The original description is accompanied by 

 a drawing of the genitalia of both sexes. 



The Subgenus DIAMANUS Jordan 



Diamanus Jordan. 1933, Novitates Zool. 39: 73. Type, Pulex montanus Baker 

 (by original designation). 



Labial palpus very long. In male, bristles of antennal segment II short, not 

 reaching middle of club. Sternal plate VIII of male very short and largely or 

 completely contained inside of VII ; sternal plate IX with each posterior process 

 setigerous and conspicuously bilobed because of a deep ventral emargination ; 

 movable finger of clasper long, flattened, somewhat swordlike, and curved for- 

 ward apically. Female with 2 subequal antepygidial bristles on each side of 

 abdomen, and with dorsolateral bristle of stylet smaller than ventral bristle. 



This subgenus includes but two species, the Nearctic montanus 

 Baker and the Palaearctic mandarinus Jordan and Rothschild. It is 

 separated from the other subgenera of Oropsylla entirely on sex 

 characters. 



Oropsylla (Diamanus) Montana (Baker) 



Pulex montanus Baker, 1895, Canad. Ent. 27 : 32. 



Ceratopliyllus montanus Baker, 1904, U. S. Natl. Mus. Proc. 27: 411, pi. 22, 



figs. 7-8, and pi. 23, figs. 1-5. 

 Ceratopliyllus acutus Baker, 1904, Invert. Pacifica 1 : 40. 

 Oropsylla montanus Wagner, 1929, Konowia 8: 314; Stanford, 1931, Utah Acad. 



Sci., Arts and Letters Proc. 1931 : 154. 

 Diamanus montanus Jordan, 1933, Novitates Zool. 39 : 72. 



Type host. — "Large mountain grey-squirrel {Sciuras abertif) ." 



Type locality. — Fort Collins, Colo. 



Range. — Western part of the United States arid Mexico. 



This squirrel-infesting species is well illustrated by Baker (1904). 

 It is medium sized and dark bro\vn and can be identified by the 

 characters of the terminalia as given in the description of the sub- 

 genus. 



The Subgenus OPISOCROSTIS Jordan 



Opisocrostis Jordan, 1933, Novitates Zool. 39* 73. Type, Pulex hirsutus Baker 

 (by original designation). 



Frontal tubercle variable in shape and size, but never large and never 

 acutely angulate apically but frequently narrowly rounded or broadly rounded 



