RHITHRODONTOMYS. 261 



Genl. Char. Similar to R. megalotis, but darker; nasals equal in 

 length to premaxillae. 



Color. Above dull fulvous brown lined with black; sides buffy 

 ochraceous; beneath plumbeous washed with buffy salmon; pectoral 

 patch fulvous; tail dark brown above, gray beneath; hands and feet 

 white; ears dark brown. 



Measurements. Total length, 156; tail vertebrae, 87; hind 

 foot, 17.5. 



c. obscurus (Reithrodontomys!), Merr., Proc. Wash. Acad. Scien., 



in, 1901, p. 558. 

 DUSKY HARVEST MOUSE. 



Type locality. Sierra Madre, near Guadaloupe y Calvo, State of 

 Chihuahua, Mexico. 



Genl. Char. "Similar to R. megalotis, but everywhere much 

 darker; upper parts conspicuously lined with and darkened by black 

 hairs, under parts buffy salmon (instead of white), with pale fulvous 

 pectoral patch; skull as in R. megalotis." 



Color. Above mixed rufous and black, darkest on dorsal region; 

 sides paler, a mixed gray and dark buff; under parts buff; no lateral 

 line; hands and feet white; tail above dark brown, beneath whitish. 



Measurements. Total length, 167; tail vertebrae, 90; hind 

 foot, 19. 



251. longicaudus (Rcithrodon!}, Baird, N. Amer. Mamm., 1857, p. 451. 



longicaudus (Rhithrodontomys} , Elliot, Syn. N. Am. Mamm., 1901, 



p. 151. Id. Suppl. p. 494. 

 LONG-TAILED HARVEST MOUSE. 



Type locality. Petaluma, Sonoma County, California. 



Geogr. Distr. Lower California, Mexico, to California, west to 

 the Sierra Nevada, from coast region of Monterey County, north to 

 Mendocino County (Eureka, Humboldt County, see Elliot, Field 

 Columb. Mus., in, p. 186. Zoology), and in the interior from San 

 Joaquin County, north to Tehama County. Probably further south 

 irregularly in the coast and San Bernardino ranges of mountains. 

 (Allen.) 



Genl. 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 yellowish, and with a fulvous lateral line from cheeks to 

 rump; beneath grayish white, tinged often with yellow, and fre- 

 quently with a fulvous spot on the breast; ears dusky, rusty brown 

 tuft at the anterior base; feet whitish; tail dusky above, grayish 

 white below. 



