432 Bulletin American Museum of Natural History. [Vol. XX, 



As shown by Dr. Allen [this Bulletin, XII, 1899, pp. 214-216], 

 the color of the upper parts varies from red, more or less 

 bright, to dark olivaceous ; he considers the former a breeding 

 and the latter a summer or post-breeding pelage. My strong 

 impression, however, is that the depth of coloring is connected 

 in some way with the habitat. We observed that specimens 

 shot near sea-level [Sciurus saltuensis bondcz] were generally 

 red, no matter in what month they were found; while those 

 from the mountains [Sciurus saltuensis} were commonly dark 

 at all seasons; the rule, however, is not invariable, as we have 

 some dark ones from near the coast and a few bright red ones 

 from the higher mountains. At Minca (2000 feet) the two 

 varieties were about equally common in May. It may be 

 well to note that our first collections were from Bonda, and 

 nearly all the squirrels were red; as dark ones were brought 

 in we noted the difference and always saved such specimens if 

 we could, while often rejecting the red ones. Consequently 

 the collection does not give a correct idea of their relative 

 abundance." H. H. S. 



17. Sciurus saltuensis bondae Allen. Sixty specimens, 

 including large series of adults of both sexes, and a number 

 of young specimens of various ages, all collected at Bonda 

 except two, taken at Minca. More than half were collected 

 in July, and most of the others late in June or early in August, 

 the months from November to May being represented by only 

 from i to 3 specimens each. Many of the specimens are in 

 moult, and the gradual change of pelage can readily be traced. 



This squirrel, like many others, is subject to a wide range 

 of seasonal variation in color. In all specimens the ventral 

 surface is pure white, the white extending forward to the 

 posterior border of the throat, and down the inside of the 

 limbs as a narrow band on the fore limbs ending about half 

 way between elbow and wrist; on the hind limbs, about half 

 way between knee and heel. The rest of the pelage varies 

 from intense bright rufous to olivaceous, except the tail, 

 which is always deep red, the basal portion excepted, which 

 latter varies in color with the season, like the rest of the 

 dorsal pelage. The brilliant rufous phase is evidently the 



