NO. 4 FLEA GENUS PEROMYSCOPSYLLA — JOHNSON AND TRAUB 43 



PEROMYSCOPSYLLA HAMIFER HAMIFER (Rothschild, 1906) 



Figures 74, 75, T], 78, 80, 82, 116, 117 



Ctenopsyllus hamifer Rothschild, Canadian Ent., vol. 38, p. 324, fig. 44, 1906. 

 Ctenopsylla hamifer Wagner, Akad. Nauk S.S.S.R. Zool. Inst., Parazitol. 



Sbornik (Mag. Parasitol. Mus. Zool. Acad. Sci.), Leningrad, vol. i, p. 148, 



1930. 

 Leptopsylla hamifer Collins, in Stiles and Baker, U. S. Publ. Health Serv., 



Nat. Inst. Health Bull. 163, p. 1019, 1934. 

 Leptopsylla hamifer hamifer Jordan, Nov. Zool., vol. 40, p. 265, 1937; vol. 41, 



p. 319, fig. 271, 1939. 

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



Nat. Inst. Health Bull. 178, pp. 121, 122, 1942. — Hubbard, Fleas of vi^estern 



North America, pp. 336, 337, fig. 213, 1947. 

 Peromyscopsylla hamifer markzvorthi Hubbard, Fleas of western North 



America, pp. 336, 337, fig. 203, 1947. 

 Peromyscopsylla hamifer hamifer Holland, Canada Dept. Agr. Techn. Bull. 



No. 70, p. 176, pi. 40, figs. 328-330, map 42, 1949. — Hopkins, Ann. Mag. 



Nat. Hist., ser. 12, vol. 4, pp. 542, 543, 1951 (sinks markworthi). 



Head (fig. 74). — In general outline, much as hesperomys. Differs 

 in that there are three, not two, bristles in subdorsal row between 

 frontal angle and antennal groove; two rather slender spiniforms at 

 frontal angle, not three or four. Upper genal spine the longer ; genal 

 process hidden behind genal ctenidium ; genal lobe (G.L.) much re- 

 duced, less than one-half length of lower genal spine. Apical bristles 

 on second antennal segment three-fourths as long as club in male, to 

 apex of club in female. Postantennal area with four regular rows of 

 bristles. 



Thorax. — As in hesperomys, except mesonotum with three rows of 

 bristles plus some scattered anterior bristles, and no erect bristles dor- 

 sally (fig. 23). 



Abdomen. — As in hesperomys, except posterior row of bristles in 

 male may extend well below the spiracle on typical terga; three 

 antepygidial bristles in male, five or six in female (rarely four). 



Male. — Portion of eighth tergum posterior to spiracle with two rows 

 of bristles, first row of three medium-sized bristles, posterior of three 

 much longer bristles. Eighth sternum (fig. 78) with truncate apex; 

 ventrocaudal angle subacuminate ; ventral margin irregularly concave ; 

 apex bearing four long submarginal bristles and two very small mar- 

 ginal bristles; low^er lobe virtually absent, this area with one long 

 marginal bristle; membranous process (M.P.) well defined, apically 

 acute, spiculated. Immovable process of clasper (fig. 82, P.) with 

 rounded apex; posterior margin slightly convex with indentation 

 above middle at insertion of characteristic bristle which is about one- 



