30 Fleas of Eastern United States 



8. Frontal tubercle prominent. Females with two antepygidial bristles 



OpisocrosVs, p. 42 



Frontal tubercle small and acuminate. Females with three ante- 

 pygidial bristles Oropsylla, p. 44 



9. Fifth tarsal segment of each leg armed with four pairs of lateral 



plantar bristles and a basal ventral pair 10 



Filth tarsal segment of each leg armed with five pairs of lateral plantar 

 bristles (the basal pair may be slightly displaced toward the median 

 line) 11 



10. Postantennal region armed with one or no bristles in addition to those 



of the marginal row. Frontal tubercle small Opisodasys, p. 56 



Postantennal region armed with two or three bristles in addition to 

 those of the marginal row. Frontal tubercle large, Orchopeas, p. 58 



11. Pronotal ctenidium consisting of twelve or more spines on a side ... 12 

 Pronotal ctenidium consisting of less than twelve spines on a side . . 13 



12. Head of the receptaculum seminis globular; movable finger as wide 



as long Odontopsyllus, p. 46 



Head of the receptaculum seminis not globular; movable finger longer 

 than wide Ceratophyllus, p. 48 



13. Movable finger with spiniforms; tail of the receptaculum seminis not 



long and not curved about head Megabothris, p. 67 



Movable finger without spiniforms; tail of the receptaculum seminis 

 long and curved about head Nosopsylhis, p. 73 



RHOPALOPSYLLUS BAKER 

 Rhopalopsyilns Baker, 1905, Proc. United States Nat. Mus., 29:128. 

 Genotype: Pulex lutzii Baker 



Genal and pronotal ctenidium absent. Frontal tubercle 

 large and conspicuous, acuminate, directed dorsad. Two large 

 bristles on the gena below the eye. Postantennal region of the 

 head with three rows of bristles. Posterior margin of the anten- 

 nal groove with a dense row of short spiniform bristles. One 

 long antepygidial present on a side. Fifth tarsal segment 

 armed with four pairs of lateral plantar bristles and an apical 

 submedian pair. 



This genus is represented in the East by a single species 

 which may have been introduced into this country from South 

 or Central America by rats. It is now well established in our 

 southern states. 



Rhopalopsyllus gwyni C. Fox 



(Plate VII, figs. 28, 32, 33) 



1914 Rhopalopsyllus gwyni C. Fox, United States Public Health Ser. Hyg. 



Lab., Bull. 97, p. 10, PI. Ill, figs. 1-6. 

 1923 Rhopalopsyllus gwyni Jordan and Rothschild, Ectoparasites, 1:333. 

 1932 Rhopalopsyllus gwyni Jordan, Nov. Zool., 38:292. 



