THE FLEAS OF NORTH AMERICA 49 



Jordan and Opisocrostis Jordan. The genus as a whole is Holarctic 

 in distribution, but the subgenus Opisocrostis is confined to the 

 Nearctic Region. 



The Subgenus OROPSYLLA Wagner and loft 



Typical subgenus of genus Oropsylla Wagner and loff. Type, Ceratophyllus 

 silantjeuH Wagner. 



With the characters of the genus Oropsylla and in addition: Frontal tubercle 

 acutely angulate apicaily and largely concealed in frontal notch. Labial pal- 

 pus long, extending beyond apex of trochanter I. In male, seta- on >■ gment 

 II of antenna not reaching middle of club. Basal abdominal sternal plate 

 without patch of bristles on side. Female with 3 or more antepygidial bristles, 

 male with 1 long and 1 minute brisrle. Female with head of receptaculum 

 seminis ovate or pyriform and the tail short. In male, sternal plate VIII 

 narrow, rodlike, without apical membranous appendage: sternal plate IN with 

 posterior process divided into a pair of long, broad lobes, each of which is 

 itself divided into a proximal and a distal lobe by a deep ventral incision; 

 movable linger of clamper broad, flattened, somewhat clavate: spring of penis 

 with a single, complete convolution. 



Several species, both Nearctic and Palaearctic, belong in this sub- 

 genus. It is particularly characterized by the length of the labial 

 palpus, which may extend beyond the middle of femur I in some 

 species. 



Oropsylla (Oropsylla) alaskexsis (Baker) 



Ceratophyllus alaskensis I'.aker. 1904, U. S. Natl. Mus. Proc. 27: 394. 

 OropsyUa alaskensis Warner. 1929. Konowia S; : 313. 



Type h ost. — Cift Uus barro we nsis ( Merr. ) ( ground squirrel ) . 



Type locality. — Point Barrow. Alaska. 



Range. — Known only from Alaska. 



The type locality of this species represents the farthest-north 

 record for the order in continental North America. It is a flea above 

 medium size and is seldom found in flea collections. 



Oropsylla (Oropsylla) arctomys (Baker) 



Ceratophyllus arctomys Baker. 1904. U. S. Natl. Mus. Proc. 27: 411, pi. 22, 



figs. 1-6. 

 Oropsylla arctomys Wagner. 1929, Konowia 8: 315: I. Fox. 1940, Fleas of 



Eastern United States, p. 45. pi. 9. figs. 40. 41, and 43. 



Type host. — Marmota monax (L. ) (woodchuck). 



Type locality. — Peterboro. X. Y. 



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



Oropsylla (Oropsylla) idahoensis (Baker) 



(Fig. 7. D) 



Ceratophyllus idahoensis Baker. 1104. U. S. Natl. Mus. Proc. 27: 413, pi. 18, 



figs. 1-6. 

 Ceratophyllus poeantis Rothschild, 1905, Novitates Zool. 12: 155. pi. 7, figs. 



22 and 23. 

 Ceratophyllus bertholfi C. Fox, 1927. Arner. Ent. Soc. Trans. 53:211. 

 OropsyUa idahoensis Wagner. 1930, Konowia 8: 314. 



Type host. — Citellus columhianus (Ord) (ground squirrel). 



Type locality. — Moscow. Idaho. 



467459—43 4 



