8 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. I23 



10. Only two rather slender spinlforms at frontodorsal angle of head ; 



anal stylet three or more times as long as broad; usually with 



three antepygidial bristles (rarely four) scotti I. Fox, p. 27 



Three (rarely four) spiniforms at frontodorsal angle of head; anal 

 stylet less than three times as long as broad; always with four 

 antepygidial bristles 11 



11. Frontodorsal angle of head rather rounded (fig. i) ; apical bristles 



of second antennal segment one-half length of club; sinus of 

 posterior margin of seventh sternum fairly deep (fig. 40) 



ebrighti (C. Fox), p. 24 

 Frontodorsal angle of head sharp (fig. 43) ; apical bristles on 

 second antennal segment three-fourths length of club; sinus of 

 posterior margin of seventh sternum very shallow, almost straight 

 (fig. 46) draco Hopkins, p. 26 



12. Posterior margin of seventh sternum with deep sinus and large 



upper lobe (figs. 8, 24, 26) 13 



Posterior margin of seventh sternum with very small sinus, or sinus 



concave and rather shallow (figs. 25, 27, 28) 14 



13- Upper lobe on posterior margin of seventh sternum narrowly tri- 

 angular, not convex dorsally, sinus narrow (figs. 8, 26) (eastern 



United States and Canada) hcspcromys hcspcromys (Baker), p. 8 



Upper lobe on posterior margin of seventh sternum broadly tri- 

 angular, convex dorsally, sinus broad (fig. 24) 



hcspcromys pacifica Holland, p. 19 

 14. Anterior margin of head almost vertical (fig. 12) ; dorsal bristles 

 on mesonotum thick and somewhat erect, particularly anteriorly 

 (northern Rocky Mountain region) 



hcspcromys ravallicnsis (Dunn), p. 14 

 Anterior margin of head oblique (fig. 11) ; dorsal bristles on meso- 

 notum not noticeably thicker anteriorly (southwestern United 

 States, Rocky Mountain area, Mexico) 



hcspcromys adelpha (Rothschild), p. 17 



PEROMYSCOPSYLLA HESPEROMYS HESPEROMYS (Baker, 1904) 

 Figures i-io, 15, 26, 37, 104-106 



Ctenopsyllus hcspcromys Baker, Proc. U. S. Nat. Mus., vol. 27, pp. 427, 428. 



452, 1904. 

 Ctcnopsylla hcspcromys C. Fox, U. S. Publ. Health Serv., Bull. U. S. Hyg, 



Lab. No. 97, p. 25, pi. 20, fig. 55, 1914. 

 Lcptopsylla hcspcromys Rothschild, Nov. Zool., vol. 22, p. 304, 1915. — JordaN; 



Nov. Zool., vol. 34, p. 186, 1928. 

 Ctcnopsylla hcspcromys Wagner, Akad. Nauk S.S.S.R. Zool. Inst., Parazitol 



Sbornik (Mag. Parasitol. Mus. Zool. Acad. Sci.), Leningrad, vol. i, p. 147, 



1930. 

 Peromyscopsylla spinijrons 1. Fox, Proc. Ent. Soc. Washington, vol. 41, p. 48 



1939- 

 Peromyscopsylla hcspcromys L Fox, Fleas of the eastern United States, p. 84 



pi. 22,, figs. 117-119, 1940 (sinks spinijrons). — Jellison and Good, U. S 



Publ. Health Serv., Nat. Inst. Health Bull. 178, p. 122, 1942. 



