MAMMALS OF THE MEXICAN BOUNDARY. 187 



the iiniflie this hand assuiiies the i'C(_vriti'i(' i'onn ot" a small round 

 spot, sending- olt' lateral proloniiations to join the white circles around 

 the nares. The bases of these black triangular spots corres])ond to 

 the upper margin of the muffle above and to the outer l)order of the 

 nostrils laterally, those at the sides blending apically with the 

 whitish area behind them and becoming obliterated toAvard the 

 angle of the mouth; l)elow them are two white patches, also tri- 

 angular, forming a border to the upper lip, their bases correspond^ 

 ing to that portion of the sides of the muffle which is below the 

 nares. The chin, a broad stripe around the angle of the mouth, 

 and the muzzle behind the region just described, are white. A 

 light median area extends backAvard from the Avhite muzzle, diverges 

 so as to form an anterior border to the V-shaped space, becoming 

 white and broadly encircling the orbits, thence passing indistinctly 

 backward to the base of the ears behind, where there is a large patch 

 of Avhite. There is a smaller triangular white spot in front of the 

 ear notch, and the concavity of the ear is clothed Avith long white 

 hairs. Throat white, changing to ash plumbeous upon its sides by 

 the abbreviation of the Avhite tips Avhich giA'e the color to this region. 

 Sides of neck ash plumbeous annulated Avith Avhite. Convexity of 

 ears grayish, like the rest of the npper surface, the coat being dense 

 and rather long; terminal portion edged Avith blackish. There is 

 a light rusty tinge in front of the base of the horns. The edge of 

 the eyelids, lashes, and broAvs are jet black. The long bristles around 

 the mnzzle correspond in color to that of the hair, those above being 

 Mack and those beloAv white. Behind the Avhite chin is a black 

 i-pot at either side of the jaAV, barely cut off from the edge of the lip 

 by a narrow Avhite line, and obscurely connected by a dusky grayish 

 band extending across the jaw, BeloAV the throat the neck is ash 

 plumbeous, like its sides. At the chest the color changes abruptly 

 to plumbeous or fuliginous black, growing lighter posteriorly. Ex- 

 cept upon the axilla\ there is no Avhite in front of the inguinal 

 region, whence the white extends laterally to the inside of the thighs 

 and upward to the tail, coAering its under surface and the buttocks 

 on either side, forming as conspicuous a patch, Avhen A^ieAved from 

 behind, as in the mule deer. There is no Avhite upon the limbs 

 below the axillse and holloAvs of the thighs. The tufts of bushy 

 hair surrounding the tarsal and metatarsal glands are paler than 

 elseAvhere, but not conspicuously so; naked portion of the metatarsal 

 gland, Avhich is hard to find among the bushy hair, measures 13 mm. 

 in length. The limbs are rather uniform light fuh'ous, to Avhich a 

 sandy hue is imparted by a slight admixture of rust}' Avith the 

 exposed plumbeous base of the hairs; their inner sides are somewhat 

 paler and the anterior l)order rustier. A dusky spot is situated 

 between the false and lower hoofs of the hind limbs. The dorsum 



