Family Dolichopsyllidae Baker 67 



on "Peromyscus leucopus," in the United States National 

 Museum. 



MEGABOTHRIS JORDAN 



Megabothris Jordan, 1933, Nov. Zool., 39: 77. 



Genotype: Ceratophyllus walkeri Rothschild 



General structure very similar to that of Ceratophyllus. 

 Pronotal ctenidium with about ten spines on a side. Fifth 

 tarsal segment of each leg with the basal pair of plantar bristles 

 noticeably displaced toward the median line, the other four 

 pairs of lateral plantar bristles unchanged. Movable finger 

 of the male with several heavily pigmented spiniforms on the 

 posterior margin. 



This genus is represented in the East by five species "which 

 occur on various rodents. They may be separated by the 

 illustrations on Plates XVII, XVIII, and XIX, and by the 

 following key: 



Key to the Eastern Species of Megabothris 



1. Postantennal region of the head with but three bristles in addition to 



those of the marginal row 2 



Postantennal region of the head with five bristles in addition to those 

 of the marginal row M. asio 



2. Movable finger of the male with two spiniforms apically M. acerbus 



Movable finger with one spinif orm apically, or with none 3 



3. Movable finger without spiniforms distally; receptaculum seminis 



vermiform M. wagneri 



Movable finger with a spinif orm or heavily pigmented bristle distally; 

 receptaculum seminis not vermiform 4 



4. Posterior margin of the movable finger expanded apically into a proc- 



ess which bears a heavily pigmented bristle or spinif orm; head of the 



receptaculum seminis rounded apically M. quirini 



Posterior margin of the movable finger not as above; head of the 

 receptaculum seminis narrowed apically and at the base . . . .M. vison 



Megabothris asio (Baker) 

 (Plate XVII, figs. 85, 86, 88, 89) 



1904 Ceratophyllus asio Baker, Proc. United States Nat. Mus., 27:338. 



1905 Ceratophyllus asio Baker, Proc. United States Nat. Mus., 29: 132. 



1929 Ceratophyllus asio Jordan, Nov. Zool., 35:33, PI. I, figs. 10, 11; p. 176. 



1930 Ceratophyllus asio Jordan, Trans. IV Intern. Cong. Ent. (1928), 2:495, 

 fig. 2. 



1933 Ceratophyllus asio Stewart, Jour. New York Ent. Soc, 41: 255. 



1933 Ceratophyllus asio Jordan, Nov. Zool., 39:62. 



1933 Megabothris asio Jordan, Nov. Zool., 39: 77. 



1939 Megabothris asio I. Fox, Proc. Ent. Soc. Washington, 41:47, PI. 6, fig. 3. 



