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



As many of the deer which were saved for mounting were killed 

 and brought in in a mutilated condition by native hunters, only 

 about one- third of the specimens were measured before skinning, 

 and of these many are immature. Only six of the measured bucks 

 appear to have been fully adult, and of these only two or three were 

 'old adults.' Of the measured does eight are adult, while several 

 of them are quite old. The collector's available external measure- 

 ments are as follows: 



Males, 6 adults: Total length, 1440 (1384-1461); head and body, 

 1217 (1168-1245); tail vertebrae, 223 (191-254); ear from notch, 141 

 (130-146). 



Females, 8 adults: Total length, 1277 (1182-1340); head and 

 body, 1123 (1092-1156); tail vertebras, 191 (178-197); ear, 140 (127- 

 146). 



The pelage of the Sinaloa Deer is fine and short, and thus very 

 unlike that of northern deer. While there are only a few summer 

 specimens, the large series of winter specimens gives abundant oppor- 

 tunity for the study of individual variation 'in coloration. The species 

 was originally based on two immature December specimens, which 

 prove to represent the average winter coloration, but a fuller descrip- 

 tion, based on the present ample material, is now presented. Also 

 many illustrations of skulls are given, to illustrate not only the 

 cranial characters, but their wide range of variation. 



In January specimens the pelage of the upper surface has a length 

 of only about 12 to 15 mm.; the individual hairs are smoke-gray, 

 lighter at the extreme base, with pale buffy gray tips. The general 

 coloration is, in general effect, in average specimens, pale buffy gray,, 

 darker on the middle of the back, shoulders, and dorsal aspect of 

 the neck, and quite blackish on the forehead and crown; the flanks, 

 are lighter and more buffy, shading into a rather ill-defined lateral 

 line of yellowish drab ; sides of face, sides of neck, and ears externally 

 dingy gray brown; there is the usual whitish noseband, divided 

 mesially and bordered by dark brown; the upper surface of the tail 

 is strong fulvous, sometimes mixed with dusky, the sides and lower 

 surface white; the throat, from the chin posteriorly, is dull white 

 or grayish white, with the usual chin-bar of black, broken in the 

 middle by white; on the foreneck the white of the throat passes 

 into pale brownish gray, which shades into darker drab-brown on the 

 chest; axillar regions fulvous; inside of fore legs white; belly white, 

 as is the inside of the hind legs, the white extending down the in- 

 side of the legs in a narrowing band, nearly to the "knees "; legs. 



