6o NORTH AMERICAN MALLOPHAGA 



Trichodectes geomydis Osborn. 

 Plate VIII, figs, i, 3 and 6. 



Trichodectes geomydis Osborn, Bui. 7, n. s. U. S. Dept. Agr., Div. Ent, p. 54, fig. 



42, (1896). 

 Trichodectes calif ornicus Chapman, Ent. News, vol. 8, pp. 186-187, pi. 9, (1897). 

 Trichodectes calif ornicus Paine, Ent. News, vol. 23, p. 440, pi. 20, fig. 2, (1912). 



Specimens from Thomomys bottae laticeps (California) and Tho- 

 momys sp. (S. Yolla Bolly Mt., Tehama county, California). The species 

 has previously been recorded from Thomomys species in California, Geo- 

 mys bur sarins from Iowa, and a Central American Geomyid, Macrotomys 

 heterodus, from Costa Rica. It has been stated that the species is closely 

 related to T. mephitidis Osborn ; yet the two are really quite different, 

 the projection on the posterior margin of the first antennal segment of 

 the male and the stout antennae of the female, distinguishing T. geomydis 

 at once; and any revision of the genus would probably place these two 

 species in separate subgenera, at least. 



The examination of the types of Trichodectes calif ornicus Chapman 

 has convinced us that this species cannot be considered as distinct from 

 T. geomydis. T. calif ornicus has been reported from Perognathus sp. 

 (Baja California) and Dipodomys merriami (Arizona). 



Trichodectes castoris Osborn. 



Trichodectes castoris Osborn, Bui. 5, n. s. U. S. Dept. Agr., Div. Ent., p. 241, fig. 



149, (1896). 



From beaver, Castor castoris. We have not seen this species. Os- 

 born states that it is very similar to both T. geomydis and T. mephitidis, 

 but that "the shallowness of the frontal hollow distinguishes it easily from 

 geomydis, and the form of the head and greater length of the antennae 

 from mephitidis." 



Trichodectes mephitidis Osborn. 



Plate VIII, figs. 2, 4, 5. 



Trichodectes mephitidis Osborn, Bui. n. s. U. S. Dept. Agr., Div. Ent., p. 242, fig. 



150, (1896). 



Trichodectes minutus Paine, Ent. News, vol. 23, pp. 439-440, pi. 20, fig. 4, (1912). 



Numerous specimens from Mephitis occidentalis (San Hedrin Mt. 

 and Palo Alto, Calif.), Spilogale phenax (Marin county, Calif.), Mephitis 



