324 U. S. P. R. R. EXP. AND SURVEYS —ZOOLOGY—GENERAL REPORT. 
crowded, not very strongly marked, subquadrate blotches, separated by black and yellowish 
brown ; towards the nape this mottling blends into a more uniform grayish, and a similar con¬ 
dition is seen on the sides, where obsolete black forms a faint mottling. The under parts are 
of a rusty yellowish white, deepest between the fore legs, on the sides of the head and neck, the 
axillae. The throat and chin and the genital regions are dirty white. The top of the head, is 
a chestnut brown, paler towards the occiput. There is a ring round the eye of a lighter color 
than the rest of the face. 
The upper part of the tail is a mixed black and yellowish gray, the margin all round a pale 
brownish white or yellowish ; there is a broad subterminal bar of black, about one-third as 
long as the caudal vertebrse. The under surface of the tail, within the light-colored margin, 
is a uniform light chestnut, the subterminal black showing through. The hairs beneath the 
tail show no annulation whatever, except near the tip, where they are mostly black, but with 
chestnut base and pale tip. Above, the caudal hairs are annulated black and grayish yellow. 
The under fur is quite full and soft, even in the summer specimens ; everywhere sooty black 
at the base, then abruptly of a grayish yellow, passing into pale rusty, this latter color deepest 
on the back, becoming paler on the sides and beneath. On the back and sides numerous long 
stiff hairs are interspersed, either entirely black, or else with a subterminal grayish white or 
rusty white annulus, the extreme tip generally black. The mottling of the back is chiefly due 
to this annulation. 
This species is quite closely allied to the Spermophilus eversmannii of Siberia, (Nos. 1455,1967,) 
but is readily distinguished by larger size, shorter and more bushy tail. The top of the head 
is much more rusty, the subterminal black bar of the tail much broader. For the sake of com¬ 
parison I give the measurements of two Siberian specimens of S. eversmannii. 
Although it is by no means certain that this animal is identical with Spermophilus parryi , 
yet there appears to be no reasonable doubt on the subject. There is nothing to prevent the 
mammalia of the northwestern portions of this continent from passing over to Asia, as the strait 
intervening is frozen solid every winter. Brandt, and the Bussian zoologists generally, give 
the Siberian and American species as identical. 
Measurements. 
Current 
Name. 
Locality. 
Tip of nose to— 
Tail to end of— 
Length of— 
Longest— 
number. 
Occip. 
Tail. 
Verteb. 
Hairs. 
Fore 
foot. 
Hind 
foot. 
Fore 
claw. 
Hind 
claw. 
2651 
Spermophilus parryi._ _ 
Aricamtcbitchi.... 
2. 50 
12 00 
3. 40 
5.00 
1.60 
2.30 
.63 
.35 
1455 
Spermophilus eversmanni. - 
....do. 
Buchtorma, Sib.... 
10. 75 
3. 80 
5. 30 
1.20 
1.90 
.42 
.33 
1967 
East Siberia. 
2. 20 
9. 50 
4.70 
5. 85 
1.30 
2.00 
.44 
.36 
