3b04 MONOGRAPHS OF NORTH AMERICAN RODENTIA, 
but refer to one specimen as having the margin of the ear brown. These 
and other slight discrepancies are noted by Baird, who, in 1857, doubtfully 
referred the Lepus texianus of Waterhouse to L. callotis, but left the L. texi- 
anus of Audubon and Bachman in his list of those his material did not allow 
him to satisfactorily discuss. 
It will be noticed that in the descriptions accompanying the above-cited 
names the black spot at the tip of the ear, which is so constant in specimens 
from the United States, is not mentioned except in Waterhouse’s description 
of his “Lepus texianus?”, and that the other features of coloration apply 
strictly to the Mexican specimens, and in less degree to those from Texas, 
but not at all to specimens from the Territories of Arizona, Nevada, Utah, 
Oregon, and Wyoming. Professor Baird very distinctly referred to the differ- 
ences presented by specimens from the northward as compared with those 
from Texas and Mexico, and thought it possible the form from the more 
northern localities in the United States might prove to be a distinct species, 
at the same time calling attention to the complete gradation by easy stages 
from the one extreme to the other. Although this gradation is unquestionable 
the constancy of the very considerable differences between the northern and 
southern forms seems to warrant their differentiation as geographical races. 
Waterhouse’s description clearly refers to the northern type, which he 
describes as having the fur “long and soft, the general hue of the animal 
pale, inclining to ashy-gray, but strongly mottled with black and brownish- 
white”, “the ears with a large black patch at the apex externally”, etc., and 
hence his name, notwithstanding its unfortunate geographical allusion, is 
unquestionably applicable to the northern type, while Texas specimens, espe- 
cially those from near the Mexican border, present an. intermediate phase 
more strongly resembling the southern than the northern type. 
Lepus callotis finds its nearest ally in L. californicus, but differs from it 
so considerably in color and in other respects (as will be pointed out under 
the head of L. californicus) as to be readily distinguishable from it. From 
L. campestris, which agrees with it quite nearly in size, and also resembles 
it considerably in color, it is easily separable, as already shown in the discus- 
sion of that species; L. campestris differing from L. cadlotis in its shorter ears, 
in wanting the black on the tail, and in becoming white in winter. 
GuOGRAPHICAL DISTRIBUTION.—The habitat of Lepus callotis var. texianus 
may be given as extending from Southeastern Oregon southward to Mexico, 
and from the Sierra Nevada Mountains eastward to near the eastern border 
