MAMMALS OF TTTF, MEXICAN BOUNDARY. 187 



the muffle this band assumes the eccentric form of ;i small round 

 spot, sending off lateral prolongations to join the white circles around 

 the nares. The bases of these Mack triangular spots correspond to 

 the upper margin of the muffle above and to the outer border of the 

 nostrils laterally, those at the sides blending apically with the 

 whitish area behind them and becoming obliterated toward the 

 angle of the mouth ; below 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 backward from the white 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 white. There is a smaller triangular white spot in front of the 

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

 hairs. Throat white, changing to ash plumbeous upon it> side- by 

 the abbreviation of the white tips which give the color to this region. 

 Sides of neck ash plumbeous annulated with white. Convexity of 

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

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

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

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

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

 black and those below white. Behind the white chin is a black 

 ^pot at either side of the jaw. barely cut off from the edge of the lip 

 l>v a narrow white line, and obscurely connected by a dusky grayish 

 band extending across the jaw. Below the throat the neck is ash 

 plumbeous, like it> sides. At the chest the color changes abruptly 

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

 cept upon the axillae, there is no white in front of the inguinal 

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

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

 on either side, forming as conspicuous a patch, when viewed from 

 behind, as in the mule A^v. There is no white upon the limbs 

 below the axillae and hollows of the thighs. The tufts of bushy 

 hair surrounding the tarsal and metatarsal glands are paler than 

 elsewhere, but not conspicuously so: naked portion of the metatarsal 

 gland, which is hard to find among the bushy hair, measures L3 mm. 

 in length. The limits are rather uniform light fulvous, to which a 

 sandy hue is imparted by a slighl admixture of rusty with the 

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

 paler and the anterior border rustier. A dusky -pot i- situated 

 between the false and lower hoofs of the hind limb-. The dor-uin 



