222 BULLETIN 56, UNITED STATES NATIONAL MUSEUM. 



centic area above, and a wliite shield -shaped area below. The fawn 

 color occnpies the back and most of the neck, extending down the 

 outer side of the limbs and encircling them low down, and back- 

 ward in a narrow line, dividing the rump and ending on the upper 

 side of the tail. This color becomes more tawny on the neck, and 

 the elongated hairs forming the main are russet, tipped with black. 

 The upper side of the head, which varies from creamy white on the 

 sides to Avood brown or even tawny-fawn color above, is strongly 

 marked with brownish black in the male, and there are whitish areas 

 around the horns and at the base of the ears. The black markings are 

 much more extensive in old males than in young or female individuals. 

 In old bucks of Aiifnorapra (onericana americana the l)lack sometimes 

 occupies the whole face in front of a line connecting the horns, but, 

 in most cases, an oval fawn-colored space is inclosed. In ^[nfllocapra 

 amer'xuiiid mexicana the black becomes dark brown and only occupies 

 the end of the muzzle and a narrow space in front of the horns, nuich 

 as in northern females, leaving the middle of the u})per side of the 

 head wood 1)rown. In both forms the eyelashes are jet I)lack, and 

 there is a l)lack listing on the edges of the ear, apically, and a black 

 spot — in the male — occupying the side of the head below the angle 

 of the jaw; the latter a sex mark serving to distinguish between the 

 sexes at all ages, even in some fetal specimens. In americana the 

 tail appears to be Avhite, except for a tawny basal area on its upper 

 side, but in mcxiciuia the sides of the tail arc grayish drab. 



Yar'tattoii.s in color. — Considerable color diiferences are de})endent 

 upon season, sex, and age. An adult male (No. 440, Mearns's collec- 

 tion), killed in the Mogollon Mountai-ns, 25 miles northeast of Fort 

 Verde, central Arizona, August 2, 1886, is in full summer pelage. 



The face has a jet-black area, beginning at the nares, which it in- 

 volves, passing backward to the horns, where it ends abruptly, ex- 

 tending laterally to the orbits. On the forehead, in the middle of 

 this l)lack area, are a few light haii's. Upon the sides of the head 

 below the ears is another large black patch, Avhich shades off to red- 

 dish fulvous and white. The cheeks, space between horns and around 

 base of ears, and the lips are pure white or whitish. Below the white 

 cheeks and black forehead are })atches of pale fawn color. The ears, 

 Avhich resemble those of the horse, are very acutely pointed, straight- 

 edged for basal two-thirds anteriorly, then sinuously curved — at 

 first concave and then convex on l)order — to the tip, which points 

 toward the horn, and regularly rounded on the posterior border;' 

 convexity of ear pale fulvous; its terminal portion edged with black; 

 its extremity tipped with black, somewhat mixed with fulvous, on 

 both surfaces; inner surface of ear white, except at one point, where 

 the fulvous extends over u})on the jjosterior bordei- from the outside. 



Adult male (No. 379, Mearns's collection), killed in the Mogollon 



