T04 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
"that are pure glossy black throughout. No. 1499 (Coll. M. C. Z.) has the 
upper surface dusky, varied with pale yellowish-brown, especially anteriorly 
and on the sides; beneath, yellowish-rufous, more or less varied with black. 
No. 1496 (Coll. M. C. Z.) is blacker above, with the lower parts dusky, annu- 
lated with yellowish-brown, the two colors being in about equal proportions. 
Several other specimens from the same lot differ only in being sometimes 
more and sometimes less varied with pale yellowish-brown above, and in the 
greater or less amount of dusky below. Other specimens, from Wayne 
County, New York, and from Cook County, Illinois, are almost precisely simi- 
lar, though each, on close inspection, is found to vary more or less, in some 
feature or another, from all of the others. No. 1057 (Cook Co., Ill., Nov., 
1855) is glossy black above, sparsely varied with gamboge on the sides and 
below, forming the last stage in the transition to those which are glossy black 
throughout. 
Var. CAROLINENSIS. 
Southern Gray Squirrel. — 
VarieraL cuars.—Length of body about 9.50 inches, ranging from 8.50 to 
10.25; tail-vertebree about 8.00, ranging from 7.50 to 8.75; tail to end of hairs 
about 10.50, ranging from 9.00 to 11.50. Above, brownish-yellow, varied with 
black, with generally the sides of the neck, shoulders, and thighs mixed with 
whitish; beneath, white. Differs from var. /eucotis in its smaller size, and in 
the general color of the dorsal surface being yellowish-brown instead of 
whitish-gray. In the majority of specimens, the white-tipped hairs that in 
var. /eucotis give a whitish aspect to the whole dorsal surface (excepting over 
a restricted central area) are either wholly wanting in var. carolinensis or give 
merely a faint grayish cast to the sides of the neck, the shoulders, and thighs. 
In other words, the fulvous suffusion that pervades the pelage beneath the 
surface in var. /euwcofis reaches the surface in var. carolinensis, thereby dis- 
placing the superficial white tint seen in var. /eucotis. The transition in color 
is evidently effected by the extension of the limited brownish dorsal area 
usually seen in var. eucotis till it occupies the whole of the dorsal surface, 
accompanied with an increase in the intensity of the tint. The general color 
above of var. carolinensis is mixed yellowish-brown and black, instead of 
white, black, and yellowish-brown, with white for the prevalent tint, as in 
leucotis. 
