2 14 Bulletin American Museum of Natural History. [Vol. XI I , 



edge of the thighs, and the hind feet usually clear yellowish red, but frequently 

 the front surface of the forearm and the proximal half of the hind feet show 

 annulated hairs. 



Young. Young specimens in first pelage are usually yellowish red to dark 

 red (the tail varying greatly in different specimens), the hairs individually 

 annulated more or less strongly with black, thus resembling in a general way 

 the post-breeding pelage of the adults. 



Measurements. Type, total length, 474 mm. ; tail vertebrae, 230 ; hind foot, 

 without claws, 50, with claws, 55. Adult breeding males and females from 

 Bonda measure as follows : 13 males, total length, 472 (439-520) ; tail verte- 

 brae, 227 (205-255) : 16 females, total length, 477 (448-500) ; tail vertebra?, 223 

 (215-250). 



Skull. Premolars, \. Total length, 56 ; basal length, 42 ; zygomatic width, 

 31 ; postorbital width, 19 ; upper toothrow, 9,2 ; lower jaw (condyle to incisor 

 tips), 32 ; height, angle to condyle, 20. 



This variable species is represented by a series of 54 speci- 

 mens, of which 50 were collected at Bonda (near sea level) and 

 4 at Minca (alt. 2000 ft.). The Minca specimens were taken 

 July 24 to August i ; 36 of the Bonda specimens were taken in 

 July, 5 in June, 4 in August (Aug. 2 and 3), i in each of the 

 months May, April, and March, and 2 in November. The 

 material is therefore insufficient to show satisfactorily the varia- 

 tions of color and character of pelage incident to season. The 

 very large series of July specimens, however, shows various 

 conditions of pelage, and indicates that a large part of the color 

 variation is due to change of pelage by molt, while there is 

 also evidently a wide range of individual variation. 



In general terms, the July specimens vary from nearly uniform 

 bright red (the pure white ventral surface of course always ex- 

 cepted) to a nearly uniform olivaceous effect (the limbs excepted, 

 which are always red), due to a minute mixture of yellowish red 

 and black, the individual hairs of the upper surface being yel- 

 lowish red or red (the shade varying in different specimens from 

 light to dark red), broadly annulated near the tip with black. 

 Between these extremes there is every intermediate stage. A 

 very common intermediate stage has a narrow band of red 

 bordering the white of the ventral surface, which broadens 

 upward at the shoulders, and often meets on the back. 



On comparing the two extremes a marked difference in the 

 character of the pelage in the two phases is strikingly evident. 

 In the wholly red phase the coat is longer than in the olivaceous 



