250 Bulletin American Museum of Natural History. [Vol. XXXIV, 
yellowish red to chestnut red; underparts, including inside of limbs, pure 
white; sides of head and throat fulvous; top of head with many of the 
hairs subapically annulated with black, giving a somewhat darker cast in 
contrast with the back; also hairs of lower back and basal part of tail annu- 
lated subapically with black; tail entirely deep red on both surfaces, the 
hairs usually red to the base, but sometimes broadly annulated near the 
base with black, the black subbasal zone gradually increasing in breadth on 
the apical third of the tail; the white on the inside of the limbs varies in 
extent, being sometimes nearly absent and sometimes extending to the 
ankles and wrists. . 
In the short new pelage the upperparts are usually yellowish red annu- 
lated with black, giving generally a more or less olivaceous effect, the fore 
limbs, the inner edge of the thighs and a narrow lateral line clear yellowish 
red. The young in first pelage are usually like the adults in the short new 
coat. 
Measurements of 13 males and 16 females (collected and measured by 
members of the H. H. Smith Santa Marta expedition), all from Bonda: 
Total length, males, 472 (439-520) mm., females, 477 (448-500); head and 
body, males, 472, females, 477; tail vertebrae, males, 227 (205-255), females, 
223 (215-250). Measurements of 10 specimens (males and females, col- 
lected and measured by W. W. Brown, Jr., for the Bangs Brothers,! at Santa 
Marta, 7 miles from Bonda): Total length, 476 (460-500); head and body, 
237 (230-350); tail vertebrae, 240 (225-250); hind foot, ec. u., 56.1 (53-60). 
Ten adult skulls (all but two with the teeth considerably worn) from 
Bonda give the following: Occipitonasal length, 56.3 (55-58); zygomatic 
breadth, 31.5 (31-32); interorbital breadth, 18.5 (18-19); breadth of brain- 
case, 23.5 (22.5-24.5); length of nasals, 18 (17.5-19); diastema, 13.6 (13- 
14); maxillary toothrow, 9.3 (9-9.7). 
The Bonda specimens show not only a wide range of individual variation 
in color, but also a large amount of seasonal variation in the length of the 
pelage as well as in its coloration. In the perfectly developed breeding 
pelage a broad mantle of long red hair covers the shoulders and extends along 
the flanks, which is absent in the early stages of the shorter, yellower and 
more annulated coat of the succeeding pelage. This is demonstrated by 
specimens in molt, in which both pelages are shown. The long red hair of 
the upperparts probably comes in gradually and not by a second full molt. 
1 Cf. O. Bangs, Proc. Biol. Soc. Washington, XII, p. 186, Nov. 16, 1898. These are the 
first 10 specimens of Bangs’s table of measurements. 
It may be noted that while the total length in the Smith specimens is practically the 
same as in the Brown specimens, the ratio of the length of the tail vertebree to the total 
length is about 2.5 % less in the former than in the latter, due undoubtedly to different methods 
of taking the length of the tail. 
