1904.] Allen, Mammals from Santa Marta, Colombia. 459 



reddish orange (in fresh pelage often deep, dark red, fading into orange 

 in worn pelage) . Facial naked parts brownish black ; ' ' scrotum snow- 

 white, a singular and striking sexual mark" (H. H. Smith). 



Total length, 1346; head and body, 597; tail vertebrae, 749. Seven 

 adult males average, total length, 1290; tail vertebrae, 703. Skull 

 (type), total length, 118; zygomatic breadth, (skull broken). 

 Nine old male skulls average, total length, 121; zygomatic breadth, 

 104. (For further measurements see tables below.) 



Represented by 84 specimens, of which 50 are skins with skulls 

 or skeletons, 12 are skulls without skins, and 22 are skeletons without 

 skins. All were taken at or near Bonda, and each month of the year 

 is represented, though very few were taken in November and June, 

 while February, March, May, July, and August are each represented 

 by 10 or more specimens. Both sexes and young of various ages are 

 included. Unfortunately only a few of the specimens were sexed 

 and measured by the collector. 



This large series shows a wide range of variation in color, which 

 proves to be entirely independent of sex or age, and largely indepen- 

 dent of season. The head, shoulders, flanks, limbs, and tail vary 

 from light reddish chestnut to dusky purplish chestnut, and the dorsal 

 area from golden yellow to brilliant reddish or even clear dark red. 

 In several of the specimens the beard and front of the head are black- 

 ish. The apical third or more of the tail is often lighter than the limbs 

 or basal portion, the terminal third not infrequently fading out to the 

 color of the back, this condition agreeing with the Mycetes chrysurus 

 of I. Geoffrey. 



The hairs individually are also variable in texture and color, the 

 pelage being long, soft, silky and shining in the new, freshly acquired 

 coat, and shorter, harsher, less shining and paler-colored in the worn 

 coat. The darkest and richest-colored specimens are in fresh pelage, 

 which, as shown by the dates of collecting, is acquired at different 

 seasons by different individuals. In the paler, worn specimens the 

 individual hairs are sometimes nearly concolor from tip to base; in 

 the fresh, unworn pelage they are generally tricolor, the basal and 

 apical thirds being much darker than the middle portion. The hairs 

 of the dorsal region, in fresh pelage, are dusky at base, then orange, 

 with long, dark, bright reddish tips, which later disappear to a greater 

 or less extent by fading and wear, the basal third or fourth still 

 retaining for a time its dark brown tint, this feature, however, varying 

 greatly in different individuals. In fresh coat the head, neck, limbs, 

 and tail are very dark reddish chestnut, with a decided tinge of 

 blackish; on the head, neck, and shoulders the hairs individually 

 have the basal third or fourth blackish brown, the middle third dark 

 red, and the subapical fourth nearly black, and the extreme tips 

 dark red, giving a dusky effect to the general coloration of these 

 parts. 



