REITHRODONTOMYS. 151 



Genl. Char. Larger than A', liychei, ears larger ; color more 

 fulvous. 



Color. Above yellowish brown lined with black; sides and rump 

 more fulvous. Beneath white. 



.\fc-a.'ii/rements. Average total length, 141; tail vertebra;, 64; hind 

 foot, 16 3. 



208. montanus. {Rfithrodon), Baird, Proc. Acatl. Nat. Scien. Phil., 



1855. P- 336. 



Type locality. Rocky Mountains, San Luis Valley, Colorado ? 



Geogr. Distr. Only known from type locality. 



Genl. Char. Tail less than head and body, ears small. 



Color. Above brown and pale yellowish gray; outside of ears 

 and flanks pale yellowish brown; beneath whitish. 



Measurimftits. Total length, 101.8; tail to end of hairs, 50.8; 

 hind foot, 12.7; ear, 7.4. 



209. megalotis. [Reilhroilon), Baird, N. Am. Mamm., 1857, p. 451. 

 humtlii, Coues (under megalotis), Proc. Acad. Nat. Scien. Phil., 



1874, p. 185. 



aztecus, Allen, Bull. Am. Mus. Nat. Hist., 1893, v, p. 79. 



deserti, Allen, Bull. Amer. Mus. Nat. Hist., 1895, p. 127. 



Type locality. Janos and San Luis Spring, Sonora, near New 

 Mexico boundary. 



Geogr. Distr. Sonora, through western New Mexico and eastern 

 Arizona to Utah, California and southern Nevada. 



Genl. Char. Largest of species. 



Color. "Above mouse gray lined with darker and tinged with 

 rufous; on rump and sides a fulvous wash. Beneath soiled yellowish 

 white." (Baird, 1. c.) 



Measurements. Average total length, 143; tail vertebra, 66; hind 

 foot, 18.5; ear, 12.5. 



210. longicaudus. {Reithri.don). Baird, Mamm. N. Amer., 1857, p. 451. 

 Type locality. Petaluma, California. 



Geogr. Distr. California, west of the Sierra Nevada, from coast 

 region of Monterey County, north to Mendocino County, and in the 

 interior from San Joaquin Count}- north to Tehama County. Prob- 

 ably further south irregularly in the coast and San Bernardino ranges 

 of mountains (Allen). 



(.icnl. Char. Small, colors darkish; tail long, more than half the 

 length of head and body. 



Color. Above yellowish brown and black, darkest on dorsal line; 

 sides more \ellowish and with a fulvous lateral line from cheeks to 



