330 MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
the northern parts of the United States, and more closely resemble them 
than do the specimens from Georgia and Florida. A series of twenty-one 
specimens from Southeastern Mexico and Yucatan (Orizaba, Tehuantepec, 
and Mirador, Mexico, and Merida, Yucatan) presents but slight differences 
from those from the Atlantic States. The difference consists chiefly in the 
rufous tinge being rather stronger in the Mexican specimens, which is seen 
especially in the brighter color of the legs and feet. Yet specimens from 
Tehuantepec and Orizaba can be almost exactly matched by specimens from 
the vicinity of Washington. The Mexican specimens are fully as large as 
specimens from the Atlantic States; the seven skulls from Tehuantepec (all 
of which are, however, very old specimens), of which measurements are given 
in Table XXVIII, average rather larger than those from the United States. 
Specimens No. 136 (from Mississippi) and No. 11439 (from Merida, Yucatan) 
are as near in color in every respect as two specimens from the same locality 
can be expected to be. A specimen from the plains of Chihuahua is smaller 
and rather paler, more nearly approaching variety nutta/a than variety 
sylvaticus. 
Southern specimens generally have the ears less covered than northern 
ones, the feet less heavily furred, and the general pelage harsher and less full. 
Southern specimens also show a tendency to decidedly longer ears than 
northern ones. On the whole, however, this species presents much more 
than the average stability of character. 
In the following tables, the measurements pertaining to the general size 
have been taken from Professor Baird, my own material being essentially the 
same as his; the measurements of the skulls are, however, all original. 
Var. NUTTALLI. 
Sage Hare. 
Variety nuttalli differs from var. sylvaticus mainly in its paler tints and 
rather smaller size; proportions the same. Above yellowish-gray or brownish- 
white, varied with black; sides of body and rump whitish. Hairs with long 
black tips, as in var. sy/naticus, but with the subterminal zone pale yellowish- 
white. Under-fur grayish-plumbeous at base, passing into yellowish-brown 
apically. Posterior part of the back and the rump mixed black and white. 
As compared with variety sylvaticus, this form seems distinguishable 
mainly by its paler tints. Specimens from the plains of the Upper Missouri 
