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



Frontal tubercle angulate apically and concealed in frontal notch. Forehead 

 with 3 short rows of lateral setae, none of which is spiniform. Eyes present, pig- 

 mented. Labial palpus not reaching to apex of coxa I, 5-segmented. Postantennal 

 region of head with 3 rows of setae, first 2 incomplete. Pronotal comb with 

 usual, long, black spines. Femur I with not more than a single lateral seta; 

 coxa III without a row or patch of setae on inner surface ; segment I of tarsus 

 III longer than II, III, and IV taken together; segment V of tarsus III with 5 

 pairs of lateral plantar bristles, pair I shifted ventrally. Abdomen without 

 apical spines. Tergal plate VII without posterior median process. Male with 2 

 antepygiilial bristles on a side. Female with a single receptaculum seminis. In 

 male sternal plate VIII modified, being much narrowed and curved upward fes- 

 tally; sternal plate IX with inner vertical processes and anterior median 

 apophysis; movable finger of clasper long, flattened, without pigmented spines, 

 but with several long setae. 



Besides the type species, which occurs on squirrels in eastern and 

 central Europe and northern Asia, Tarsopsylla includes a single North 

 American species, also found on squirrels. 



Tarsopsylla coloradensis (Baker) 



(Fig. 6, B) 



Pulex coloradensis Baker, 1895, Canad. Ent. 27 : 110. 



Ceratophyllus coloradensis Baker, 1904, U. S. Natl. Mus. Proc. 27: 417, 441, pi. 

 25, figs. 6-9. 



Type host. — "Fremont's chickaree." 



Type Locality. — Georgetown, Colo. 



Range. — Known from Colorado and British Columbia. 



A medium-sized, dark-brown flea, easily identified by the fact that 

 segment I of tarsus III is longer than II, III, and IV taken together. 

 Apparently this is a rare species, of which the United States National 

 Museum contains only a single specimen, the type. 



The Genus Orchopeas Jordan 



(Fig. 7, C) 



Orchopeas Jordan, 1933, Novitates Zool. 39: 71. Type, (Pulex wickhami 

 Baker) = Pulex howardii Baker (by original designation). 



Frontal tubercle small, angulate apically, and largely concealed in tubercular 

 notch. Forehead with 1 to 2 complete rows of lateral se^ae, the .bird (front) 

 row occasionally represented by 1 or 2 setae in some species. Eyes conspicuous, 

 block. Labial palpus not reaching to apex of trochanter I, 5-segmented. Post- 

 antennal region of head with but 1 row of setae, the marginal row. Pronotal 

 comb with usual, long, black spines. Femur T with not more than 1 lateral seta ; 

 coxa III without a row or patch of spinelets on inner surface ; segment I of 

 posterior tarsus shorter than II, III, and IV -combined ; last segment of each 

 tarsus with 5 lateral plantar setae, first pair displaced ventrally. Abdomen 

 with but a few apical spines, aU situated dorsally. Tergal plate VII without a 

 posterior median process; 3 antepygidial bristles on each sirle in female, 2 in 

 male. Female with but a single receptaculum seminis, and with ventral margin 

 of sternal plate X angulate near middle. In male sternal plate VIII much 

 modified, with apical membranous appendage ; sternal plate IX with conspicuous 

 inner vertical processes, 2 pairs of highly modified distal lobes, and anterior 

 median apophysis ; movable finger of clasper broad, expanded dorsally, with 

 posterior, submarginal row of 4 to 7 upwardly directed, short, black, subequal 

 spines. 



This genus is exclusively Nearctic in distribution. 



