308 U. Ss. P. R. R. EXP. AND SURVEYS—ZOOLOGY—GENERAL REPORT. 
A young specimen from Fort Reading is rather darker than usual on the back, and may 
possibly belong to S. douglassii. On account of the locality, however, I have entered it among 
the present species. 
The reception of many additional specimens, since the preceding description was written, 
substantiate the permanence of character as given above in the California animal, and as dis- 
tinguished from the S. douglassii, These vary in the amount of hoary on the shoulders, but 
in none is the back darker than the ground color, and unbroken by mottling. The soles vary 
from entirely naked in summer skins, except immediately at the heel, to densely hairy to the 
tubercles in winter ones. Only in the latitude of San Diego do the soles appear to remain nearly 
naked throughout the year. 
This species was not recognized by Audubon and Bachman as any thing more than a variety 
of Spermophilus douglassii. Even should this be the case, its name must take precedence of the 
last named species, on account of having been published first in the pages of the Faana 
Boreali-Americana. 
This is the animal so well known in California, under the name of ground squirrel, as 
causing so much damage to the farmer by the depredations it commits on grain fields and, in 
fact, almost every agricultural product, as well as by the disturbances of the soil by its excava- 
tions. 
. . 
List of specimens. \ 
s ~ 
= Measurements. 
E | | 
x |B | 
Ss |F x i i : 
< Je 3 From tip of nose to— | Tail to = 
2 15 z 3 Locality. When Whence and how | ‘¢ | Nature of endof—| = | 5 Collected by— 
o je*|2 collected. obtained. = |specimen, me 
® |2e\% 3 : a\ 
=) a 5 Ss . 2 -|f\,e 
=e = ‘Sb 5 &/2/2/£|=2\a 
a |6 5 = Sje|/s | 2) /slels|s 
o |o n ° Bil|A!] So BB |}> | \|A/e 
Dr. Antisell........ ox 
.| Lt. Trowbridge....|.... 
Dr. J. F. Hammond)... |.. 
. 
see ete wee eee 
.| A. Cassidy ...... 
1600 |...... QD |ecreees dO. eecceee Dee. 28, 1855 eees 
468 | 7599 .| Tejon Valley, Cal.|......+.e0 eee B 
467 | 1398 A 
469) | tanene 
AND) |saceus Jeee : . ee 
494 | cccccsiones Monterey, Cal. ..)eeseee Lt.W. P. Trowbridge}.... 
1181 |......|....| Santa Clara, Cal.}......+ --| Dr. J. G. Cooper...}....|.. 
QBB4 |evecee weee|soucsesGOsecee eveclece Mecsas dO. ccscvcees 
GOB |ecscs- «e..| San Francisco...|... ..| R. D. Cutts....... 
606 |...... ceccleccccesAQrccveccveleccsees aclececene dO. .cercccees 
MOON sccwie's lovee! California .'.s.c0elewnssas ..| Philada. A. N. S...|....| Mounted. 
PRES |eceece © | Fort Reading, Cal.|... +-| Dr. J. FP. Hammond.)....) Skin ....}.ee. 
PRAOD |occcce O |ecsweccAO,ssccuceufasuvasdsceccss|eccneae dO. .ccccccens sace] UElCr ae 
