THE FLEAS OF NORTH AMERICA 57 



species as sinoma (Jordan) and telchinum (Rothschild), would be 

 placed those species in which the eighth sternal plate of the male is 

 greatly reduced, being very short, without setae, and contained in 

 the seventh sternal plate. This latter condition of the eighth sternal 

 plate of the male is the same as is found in the genus Nosopsyllus 

 Jordan. 



The subgenus TricJiopsylla is a large one including both Palaearc- 

 tic and Nearctic species. 



Trichopsylla (Trichopsylla) abaxtis (Rothschild), new combination 



Ceratophyllus abantis Rothschild, 1905, Novitates Zool. 12: 164, pi. 6, 

 fig. 10. 



Cotype hosts. — Mustela longicauda Bonap. (weasel) and Microtias 

 drumrrwndii (Aud. and Bach.) (meadow mouse). 



Cotype localities. — Canadian National Park, Alberta, and Horse 

 Creek. Upper Columbia Valley, British Columbia. 



Range. — Western Canada. 



The original description of abantis, which is accompanied by a 

 figure of the eighth sternal plate of the male, was based on two male 

 specimens. The length of the male was given as 2.80 mm. 



Trichopsylla (Trichopsylla) acerba (Jordan), new combination 



Ceratophyllus acerbus Jordan, 1923, Novitates Zool. 32: 111, fig. 43. 

 Megabothris acerbus Jordan, 1933. Novitates Zool. 39: 77; I. Fox, 1940, Fleas 

 of Eastern United States, p. 69, pi. 18, figs. 91-93. 



Type host. — Tamias striatus L. (eastern chipmunk). 



Type locality. — Canada. 



Range. — Eastern part of the United States and Cannda. 



The original description of acerba is accompanied by a figure of 

 part of the female terminalia and was based on a single specimen of 

 that sex. This species was redescribed by I. Fox (19-10), drawings 

 being given of parts of both sexes. 



Trichopsylla (Trichopsylla) adversa (Wagner), new combination 



Megabothris adversus Wagner, 1936. Ztschr. f. Parasitenk. 8: 656, fig 4. 



Type host. — Peromyscus maniculatus (Wag.) (white-footed 

 mouse). 



Type locality. — Vancouver, British Columbia. 



Range. — Known only from the type locality. 



Only a single female specimen is known. According to the author 

 of this species, it stands very near to abantis Rothschild, but the duct 

 of the receptaculum seminis is not "chitinized.'' 



Trichopsylla (Trichopsylla) asio asio (Baker), new combination 



Ceratophyllus asio Baker, 1904, U. S. Natl. Mus. Proc. 27: 406. 

 Megabothris asio Jordan, 1933, Novitates Zool. 39: 77; I. Fox, 1940, Fleas of 

 Eastern United States, p. 67, pi. 17. figs. 85-86, 88-89. 



Type host. — Otv* asio (L.) (screech owl). 

 Type locality. — Wellesley, Mass. 



Range. — This variety is widely distributed in the eastern part of 

 the United States and may occur in British Columbia, since Wagner 



