192 MICROTUS. 



284. angusticeps. {Microtus), Bailey, Proc. Biol. Soc. Wash., 1898, 



p. 86. 



Type locality. Crescent City, California. 



Geogr. Distr. Coast region of northwestern California and 

 southwestern Oregon. 



Genl. Char. Skull narrow; audital bulla? small; nasals project- 

 ing in front of incisors; enamel pattern of teeth like that of ^[. 

 mordax. 



Color. Above dark bister lined with black; sides paler; beneath 

 creamy white ; feet plumbeous gray ; tail above blackish, below 

 white. 



Measurements. Total length, 170; tail vertebrae, 56; hind foot, 

 22. Skull: basal length, 23.4; nasals, 7.6; zygomatic breadth, 13.5; 

 mastoid, 10.8; length of upper molar series, 6. 



285. alticola. [Arvieola), Merr., N. Am. Faun., No. 3, 1890, p. 67, 



pi. 5 and 6. 



Type locality. Little Spring, San Francisco Mountain, Arizona. 

 Altitude, 8,200 feet. 



Geogr. Distr. San Francisco Mountain, northwestern Arizona. 



Genl. Char. Size rather large; ears large; tail long. 



Color. Above dark bister, tinged with pale reddish brown and 

 lined with black; beneath hoary plumbeous; feet grayish; tail dark 

 brown above, grayish brown below. 



Measurements. Total length, 170; tail vertebrje, 56; hind foot, 20; 

 ear, 8. 



a .—leurophneu't. (Arvieola), Allen, Bull. Am. Mus. Nat. Hist. N. Y., 

 1894, p. 320. 



Type locality. Graham Mountains, Arizona. 



Geogr. Distr. Graham Mountains, southeastern Arizona. 



Genl. Char. Size medium; tail less than one-half the length of 

 head and body. Skull: brain-case broad and flat; interorbital region 

 very broad; angle of mandible greatly developed. 



Color. Above pale reddish brown lined with black and tinged 

 with gray; sides gray with less black ; beneath whitish gray; tail 

 above brown, whitish below. Feet dusky washed with gray. 



Measurements. Total length, 173; tail vertebrae, 50; hind foot, 

 22.5; ear, 15. 



286. mogollonensis. {Arvieola), Mearns, Bull. Am. Mus. Nat. Hist., 



N. Y. , II, 1890, p. 283. 

 T\pe locality. Baker's Butte, MogoUon Mountains, central Ari- 

 zona. 



Geogr. Distr. Plateau of central Arizona. 



