38 MISC. PUBLICATION 5 00, U. S. DEPT. OF AGRICULTURE 



to^.^-Kriowii only from British Columbia. 



The original description of vesperalis is accompanied by a draw- 

 ing of the clasper of the male and the seventh sternal plate of the 

 female. According to Jordan this species is close to pseudarctomys 

 Baker. However, the male genitalia are very different, the clasper 

 being without the posterior process, the movable finger being almost 

 straight instead of crescentic, and the upper spinelike seta on the 

 same being swordlike instead of rodlike. 



The Genus Atyphloceras Jordan and Rothschild 



(Fig. 6, E) 



Atyphloceras Jordan and Rothschild, 1915, Ectoparasites 1: 59. Type, Cerato- 

 phyllus multidcntatus C. Fox (by original designation). 



Frontal tubercle angulate apically, inconspicuous. Forehead with 3 rows 

 of lateral setae, none of the latter being spiniform. Eyes much reduced or 

 vestigial. Labial palpus with 5 to 8 segments. Postantennal region of head 

 with 3 oblique rows of lateral setae in addition to posterior marginal row. 

 Pronotal comb with usual, long, black spines. Femur I with several lateral 

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

 posterior tarsus shorter than II, III, and IV taken together; last segment of 

 tarsus III with 5 pairs of lateral plantar bristles, the first pair not being shifted 

 ventrally. Abdomen with apical spines extending down almost to level of spir- 

 acles. Tergal plate VII without a posterior median process. Three ante- 

 pygidial bristles usually on each side in female, and 1 large antepygidial 

 bristle in addition to 1 or 2 small ones in male. Female with 2 equal recepta- 

 cula seminis. In male sternal plate VIII large and practically unmodified; 

 sternal plate IX with large inner vertical processes, no median apophysis or a 

 vestigial one, and a long, setigerous, distal lobe; movable finger of clasper 

 long, flat, with conspicuous setae but no pigmented spines. 



Species of this genus are found exclusively on small North Ameri- 

 can mammals. 



Atyphloceras arttus Jordan 



Atyphloceras arttus Jordan, 1933, Novitates Zool. 39 : 69, fig. 19. 



Type host. — Peromyscus sp. (white-footed mouse). 



Type locality. — British Columbia. 



Range. — Known only from British Columbia. 



This species was described from a single female and was said to be 

 close to multidentatiis C. Fox, "but the bursa copulatrix of the same 

 long shape as in A. echis J. & R. 1915." 



Atyphloceras bishopi Jordan 



Atyphloceras oishopi Jordan, 1933, Novitates Zool. 39: 63, figs. 11 and 12. 



Type host. — Blarina brevicauda (Say) (short-tailed shrew). 



Type locality. — Fairport, N. Y. 



Range. — Known only from New York. 



As indicated in the original description, this species is identified 

 by having the labial palpus composed of five segments instead of a 

 larger number and by the distance of the frontal tubercle from the 

 fronto-genal angle "being more than one-third as long as the distance 

 of the anterior oral angle from the nearest point of anterior margin 

 of antennal groove." 



