512 - MONOGRAPHS OF NORTH AMERICAN RODENTIA. 
over, it so happens that the left ear of the type is in sufficiently good preser- 
vation to enable me to clearly recognize the peculiar conformation which 
distinguishes the present species from the others. 
To this same species I am also inclined to refer two specimens recently 
collected by Mr. H. W. Henshaw on Otter Creek, in Utah. These are. appar- 
ently young animals, but, as they are not accompanied with the skulls, the 
fact cannot be determined.* The tail of each has been skinned, and is now 
so shrivelled that nothing can be predicated as to its length, either relative or 
absolute. The specimens are quite small; they have been overstuffed, meas- 
uring now about 24 inches, but were probably not much, if any, over 2, with 
a hind foot of 0.80; in fact, they might be taken at first sight for Crice‘odipus. 
But the soles are naked along a narrow strip quite to the heel; the antitragus 
has a very prominent lobe; and even from the dried skins I determine, with 
no appreciable chance of mistake, that the ear has the other peculiarity of P. 
monticola. The pelage is remarkably soft; the coloration is different from 
that of any other Perognathi 1 have seen, being plumbeous (like the plum- 
bago-colored specimens of Geomys and Thomomys), with little admixture of 
lighter color; and the soles show a decided fulvous stripe. But these speci- 
meas exhibit the fore leg colored quite to the wrist, and I am inclined to 
attribute the dark color to their immaturity. I shall therefore assign them to 
P. monticola. 
The four specimens noticed are the only ones which have come under 
my observation. To sum the case in a few words, we have here an animal 
unquestionably distinct from any of the other species described in this paper, 
the only question being whether all the specimens referred to it are speciti- 
cally identical. They ostensibly differ to a degree that’ might have caused 
them to be described as distinct at the period when Professor Baird’s work 
was prepared. This question must await the reception of additional material 
for its satisfactory solution. I can only say that I am at present unable to 
see more than one species. Should the contrary be determined, the present 
article is to be held as based upon the Fort Crook specimen, for which I 
have suggested the name of P. modlipilosus as a provisional designation. 
“Since this was written, Mr. Henshaw tells me the animals are very young indeed—they had nof 
left the nest when captured. These are the specimens doubtfully noticed by Dr. Yarrow and myself, in 
Wheeler’s Report, s. c. 
