RODENTIA-SACCOMYINAE-PEROGNATIIUS HISPIDUS. 
421 
In this the lobed antitragus is very distinct; the soles naked. The hind legs, perhaps, have less 
of the dorsal color on their exterior. The size appears considerably larger, hut the specimen 
was probably somewhat over stuffed. 
List of specimens . 
Measurements. 
Catalogue 
number. 
Locality. 
Whence obtained. 
Nature of spe¬ 
cimen. 
Nose to end of— 
Length of— 
Ear, from 
Tail. 
Verteb. 
Fore ft. 
Hind ft. 
notch. 
1061 
Chihuahua city_ 
John Potts_ 
Skin. 
4. 50 
3. 87 
.45 
1.02 
.40 
PEROGNATHUS HISPIDUS, Baird. 
Si*. Cu. — Ears small, not projecting beyond the fur ; antitragus with a distinct lobe. Soles naked. Hair very stiff and 
. coarse. Tail as long as head (and body?). Above mixed cinnamon and black ; sides with a fulvous stripe ; beneath white. 
Entire fore and hind legs white. 
This species is strongly marked even in the genus Perognathus by the very thick, coarse, 
stiff and bristlf hair covering the whole of the body and limbs, and longer than usual. The 
ears are small, and do not project beyond the fur ; the antitragus is distinctly lobed. The feet 
are very stout and broad, the soles naked from the heel. The tail is broken in one specimen, 
(577,) in another it is as long as the head and body. It is covered with rather long stiff hairs 
lying flat to the bone, and mostly concealing the whorls; those on the upper surface rather longer. 
The upper parts are of a mixed cinnamon and black. The entire surface of the fore and 
hind legs all round with the under parts white ; a fulvous band along the sides running out on 
the hind legs. The belly hairs are white to their roots. 
Another specimen, (576,) probably of the same species, has been so discolored by long 
immersion in alcohol, as to render its tints unappreciable. It agrees, however, in general 
characters with No. 577. 
This species is smaller than P. fasciatus , and differs in the longer and much stiffer hair, 
smaller ears, the light colored thighs, and the darker color. It has not the pencilled tail of 
P. penicillatus; conpared with P. monticola, it is larger, with stouter feet, and the outsides of 
the arm and thighs are white, instead of being colored like the back. The belly hairs are 
white to the roots, instead of being plumbeous at the base. 
The penis of the male of this species is armed with a spiculum of bone half an inch long, 
perfectly straight and tapering to the end, where it is expanded, and the head is divided by a 
deep furrow. 
