84 Fleas of Eastern United States 



a place with Hystrichopsylla gigas tahavuana Jordan and 

 Tamiophila grandis (Rothschild) , all three being four or five 

 millimeters in length. Like the other two it is a parasite of small 

 mice but it is much more abundant. Pre-eminently a fall and 

 winter species, it has been collected from September to April, 

 and its favorite host seems to be the white-footed mouse. 



PEROMYSCOPSYLLA I. FOX 

 Peromyscopsylla I. Fox, 1939, Proc. Ent. Soc. Washington, 41:47. 

 Genotype: Ctenopsyllus hesperomys Baker 



Head subangulate in front. Fronto-genal angle acute. Ante- 

 rior margin of the head with a series of bristles; two, three, or 

 four of those near the fronto-genal angle thickened and pig- 

 mented. Genal ctenidium more or less horizontal, consisting 

 of two spines variable in size according to the species. Genal 

 process prominent, variable in shape. Metanotum and abdo- 

 minal tergites armed dorsally with short, stout teeth. Other 

 details as in Ctenopsyllus Kolenati. 



This genus is represented in the East by three species which 

 parasitize the common small mammals. 



Key to the Eastern Species of Peromyscopsylla 



1. Lower genal spine extending more distad than the upper one 2 



Upper genal spine extending more distad than the lower one P. catatina 



2. Sternite VII of the female with a deep sinus; movable finger of male not 



rounded apically P. hesperomys 



Sternite VII of the female without a deep sinus; movable finger 

 rounded apically P. scotti 



Peromyscopsylla hesperomys (Baker) 

 (Plate XXIII, figs. 117, 118, 119) 



1904 Ctenopsyllus hesperomys Baker, Proc. United States Nat. Mus., 

 27:428. 



1905 Ctenopsyllus hesperomys Baker, Proc. United States Nat. Mus., 

 29: 136. 



1914 Ctenopsyllus hesperomys C. Fox, United States Public Health Ser. 

 Hyg. Lab., Bull. 97, PI. XX, fig. 55. 



1915 Leptopsylla hesperomys Rothschild, Nov. Zool., 22:304. 



1928 Leptopsylla hesperomys Stewart, Cornell Univ. Agric. Exp. Sta., 

 Mem. 101, p. 869. 



1929 Leptopsylla hesperomys Jordan, Nov. Zool., 35: 177. 



1933 Leptopsylla hesperomys Stewart, Jour. New York Ent. Soc, 41:260. 

 1933 Leptopsylla hesperomys Jordan, Nov. Zool., 39:62. 

 1939 Peromyscopsylla spinijrons I. Fox, Proc. Ent. Soc. Washington, 41:48, 

 PI. 6, figs. 1, 2. 



