230 Bulletin American Museum of Natural History. [Vol. XXII, 



The extreme ochrac ecus -headed phase is the most striking and 

 beautiful of all; but the color of these parts varies in different in- 

 dividuals from deep ochraceous to pale yellow or even very pale 

 buff. 



In what may be termed an average specimen, or better still as the 

 medium phase, the general pelage is in effect brown or brownish with 

 a superficial wash of lighter, which varies from yellowish gray to 

 deep yellow. In such specimens the basal two-thirds of the pelage 

 is light, usually pale yellowish white, with a more or less broad sub- 

 apical band of dark brown or black, and the tips of the hairs light. 

 The light tips become greatly reduced in extent by wear and exposure, 

 but normally vary greatly in length, from a slight tipping to half an 

 inch or more in length. In specimens approaching the 'black phase, ' 

 the light tips are yellow, and are mainly restricted to the top of the 

 head and nape and to a narrow median band which becomes narrower 

 posteriorly and often nearly or quite disappears behind the shoulders. 



Very few specimens in a large series are near enough alike to be 

 covered in a single detailed description. The following, however, 

 may indicate to some extent the range of variation in the color of 

 the head, nape, and shoulders. First is the black phase, in which, 

 the hairs have no light tipping. Next come the blackish brown 

 specimens, with the top of the head and most of the upper surface 

 black or blackish, and the hairs of the nape, top of the shoulders, and a 

 tapering band running posteriorly to about the middle of the dorsal 

 region tipped with dull rather brownish yellow, most extensively on 

 the nape and the mid area of the shoulders. Then come lighter 

 specimens with the general coloration lighter and the light tips of 

 the hairs longer i. e., brown with a slight veiling of yellowish gray, 

 strongest on the anterior half of the body and especially intensified 

 over the region of nape and shoulders through the greater length of 

 the light tips. Next follow, perhaps, the major part of the specimens, 

 in which the body coloration is nearly the same as in the last, with 

 the light tips of the hairs generally longer. In these, however, there 

 is a wide range of variation in the color of the tips of the hairs, 

 which give the prevailing color to the top of the head, nape, and 

 shoulders. In many of these specimens the top of the head is dull 

 or pale wood brown, or dull drab, becoming lighter and more yellow- 

 ish over the nape and shoulders; in others it varies from clear buff 

 through various yellowish shades to ochraceous and 'ochraceous-rufous' 

 (Ridgway), only a relatively small proportion of the specimens being 

 of this last deep, intense shade of ochraceous. On the head the color, 



