78 Fleas of Eastern United States 



2. Genal ctenidium absent 3 



Genal ctenidium present 4 



3. Females with two receptacula seminis Atyphloceras, p. 80 



Females with one receptaculum seminis Catallagia, p. 102 



4. Genal ctenidium consisting of more than three spines 5 



Genal ctenidium consisting of less than three spines 8 



5. Genal ctenidium consisting of five or six spines 6 



Genal ctenidium consisting of four spines 7 



6. Spines of the genal ctenidium spatulate, arranged in a vertical line .... 



Nearctopsylla, p. 90 



Spines of the genal ctenidium long and slender, arranged in a hori- 

 zontal row Hystrichopsylla, p. 78 



7. Frons with two or more spinforms near the frontal angle 



Ctenopsyllus, p. 88 



Frons without such spinif orms Doratopsylla, p. 92 



8. Genal ctenidium consisting of two spines, one overlappng the other . . 9 

 The two spines of the genal ctenidium separated and not over- 

 lapping Peromyscopsylla, p. 84 



9. Fifth tarsal segment of the fore and middle legs with a basal sub- 



median pair of bristles Epitedia, p. 95 



Fifth tarsal segment of the fore and middle legs without a basal sub- 

 median pair of bristles Tamiophila, p. 100 



HYSTRICHOPSYLLA TASCHENBERG 

 Hystrichopsylla Taschenberg, 1880, Die Flohe, p. 83. 



Genotype: Pulex talpae Curtis 



Eye vestigial. Labial palpus consisting of five segments. A 

 genal and a pronotal ctenidium present. Abdomen with a row 

 of lateral teeth on tergites II, III, and IV. Each abdominal 

 tergite armed with three rows of bristles. Females with two 

 receptacula seminis. Three antepygidial bristles present in the 

 male, four in the female, on each side. Anterior tibia provided 

 with a comb of robust heavily pigmented bristles on the poste- 

 rior border. Fifth tarsal segment of each leg armed with five 

 pairs of lateral plantar bristles, without a basal submedian pair. 

 Size large, four or five millimeters in length. 



This genus is represented in the East by a single rare species 

 which is parasitic on wild mice. 



Hystrichopsylla gigas tahavuana (Jordan) 

 (Plate XXI, figs. 106, 107, 108) 



1929 Hystrichopsylla gigas tahavuana Jordan, Nov. Zool., 35: 173, fig. 8. 

 1933 Hystrichopsylla gigas tahavuana Stewart, Jour. New York Ent. Soc, 



41:260. 

 1933 Hystrichopsylla gigas tahavuana Jordan, Nov. Zool., 39:65: 



