SACCOMYIDA‘i—PEROGNATHIDINA—P. FASCIATUS. 503 
The tail is completely but rather thinly haired, and, especially toward 
the end, the hairs stand apart and are somewhat lengthened (as is usual in 
the genus) ; still they do not develop into the decided comb or crest, or tuft 
at the end, which is characteristic of P. penicillatus. 
The pelage of this species is coarse, harsh, and stiffish (as in other 
species of typical Perognathus), but not to a degree which could bear the term 
“spiny”, or even “bristly”; it has been likened to fine-spun glass, though 
such expression might be considered strong, unless excessively delicate glass 
is meant. The fur has considerable gloss; there is no under fur whatever. 
The character seems to me to be much as in the Murine Sigmodon hispidus, 
and in fact the specimens before me have considerable superficial resemblance 
to the young of that species. A likeness to Zapus hudsonius is perhaps even 
stronger. The color of the upper parts is a light sandy-yellowish, closely 
lined throughout with blackish, producing a fine grizzle. The greater part 
of the length of the individual hairs is the color of barely-tarnished cut lead ; 
it is rather light, and unlike the heavier plumbeous of most Rodents. This 
is succeeded by the sandy ends of the hairs; a part of them are of this last 
color to the very end, while others have the tips blackish, producing the 
grizzle above mentioned. The line of demarcation of this color begins on 
the side of the nose, and runs straight over the shoulder ard sides of the 
body, descending the hind limb to the heel. To this succeeds a strip of rich 
reddish-yellow or salmon-color, beginning on the cheeks and following the 
line already indicated to the heels, but also descending a little way on the 
fore leg. This color is pure, the hairs being so colored to the roots, there 
being no plumbeous basal portions and no blackened tips. The whole under 
surface, together with the feet, most of the fore leg, and the inner aspect of 
the hind leg, is white, and on these white areas the hairs are of this color to 
the roots. The line of demarcation with the fawn-color is pretty sharp, but 
less so in some cases than in others, sometimes the whole belly showing a 
tawny shade. The tail is bicolor; a brown or dusky stripe runs the whole 
length of the upper surface; the sides and under surface being white or 
tinged with rusty—the latter particularly when the white of the belly is simi- 
larly tinged. Besides these special markings, there is decided indication of 
a dusky stripe from the uose under the eye and ear to the side of the neck, 
produced by increase of the blackened tips of the hairs along the line. Some 
of the whiskers are black, others being colorless. The pouches are white 
inside. The claws are colorless. 
