NO. 4 FLEA GENUS PEROMYSCOPSYLLA— JOHNSON AND TRAUB 47 



PEROMYSCOPSYLLA HAMIFER VIGENS (Jordan, 1937) 

 Figures 76, 79, 81, 118 



Leptopsylla hamifer vigens Jordan, Nov. Zool., vol. 40, p. 265, figs. 47, 48, 1937- 

 Peromyscopsylla hamifer vigens Jellison and Good, U. S. Publ. Health Serv., 

 Nat. Inst. Health Bull. 178, p. 122, 1942.— Hubbard, Fleas of western North 

 America, pp. 336, 337, fig- 204, I947- 

 Head, thorax, and abdomen.— As in hamifer hamifer. Differs in the 

 male in details of the modified abdominal segments. The ventral mar- 

 gin of the immovable process of the clasper (fig. 8i, P.) is sharply 

 angled at juncture with the manubrium, not evenly curved as in h. 

 hamifer; the dorsal margin of movable finger or digitoid of clasper 

 (F.) is usually markedly convex, not straight or slightly concave; 

 dorsal lobe of sternum 8 (fig. 76) narrower than in h. hamifer, bearing 

 an oblique row of three submarginal bristles, the upper two very long, 

 the most ventral short, with two small marginal bristles nearer dorsal 

 than ventral angle of posterior margin. Distal arm of sternum 9 

 (fig- 79) with more sharply upturned apical portion, apex not trun- 

 cate- no small bristles present on semimembranous portion, which is 

 not as expanded as in h. hamifer; lateral sclerotized surface with many 

 more and longer bristles than in h. hamifer; none of posterior (ven- 

 tral) marginal bristles elongate. 



Aedeagus (fig. 118).— Differs from that of h. hamifer in that the 

 patch of microverrucae or spicules is larger, extending ventrally to 

 level of base of crochets; with striations extending from fulcrum 

 to upper portion of patch of spicules (striae absent in h. hamifer). 

 Fulcrum (FM.) with a distinct, relatively well-sclerotized process 

 (FMP) which arises from fulcrum at level of apex of inner tube 

 (S.I.T.) and extends to near apex of DL.L., the process variable m 



position. u 1 • 11 



The females of h. hamifer and h. vigens are not morphologically 



distinguishable, and must be determined only with associated males 



or by geographic location. 



Length.— Male, 2.3-2.6 mm. ; female, 2.8-3.0 mm. 

 Type series.— From Microtus, Ravalli County, Mont. 



Records of Specimens Examined 

 United States. Colorado: Clear Creek County (Microtus pennsylvanicus) ; 

 Estes Park (Microtus sp.). New Mexico: Catron County (Mtcrotus sp.) ; 

 San Miguel County (M. pennsylvanicus) ; Sandoval County (M. pennsylvamcus 

 aztecus). Utah: Cache County (Microtus sp.) ; Salt Lake County (M. mon- 

 tanus). Wyoming: Yellowstone National Park (Microtus sp.). 



