312 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
List of specimens. 
| Catalogue number. 
Number of skull. 
Locality. 
When collected. 
Whence obtained. 
Original number. 
Nature of specimen. 
Measurements. 
Collected by- - 
Nose to occiput. 
Nose to toil. 
Tail to end of 
vcrteb. 
Tail to end of 
hairs. 
| Fore claw,length. 
Hind foot, length. 
| Hind claw, length. 
Skull, length. 
Skull, width. 
338 
1255 
1422 
Santa Catarina, 
N. Leon. 
Victoria, Tamau- 
lipas. 
Apr.,1853 
Lt. D. N. Couch. 
190 
Mounted. 
Skull.... 
2.25 
10.00 
5.50 
6.67 
.33 
2.08 
.33 
2.39 
1.40 
1.48 
Dr. Berlandier. 
SPERMOPHILUS LATERALIS. 
Say’s Squirrel. 
Sciurus lateralis, Sat, Long’s Exped. R. Mts. II, 1823, 46. (Arkansas river, lat. 38°.25 ; long. 105°.20; July 16.) 
Harlan, Fauna Amer. 1825, 181. 
Fischer, Synopsis, 1829, 350. 
Godman, Am. Nat. Hist. II, 144. 
Griffith, Cuvier, V, 1827, 255. 
Wagner, in Schreber Saugt. IV ; pi. ccxiv, B. (No text.) 
Arclomys ( Spermophilus) lateralis, Rich, Zool. Jour. Ill, April, 1828, 519.— Ib. Fauna Boreali-Americana, I, 1829, 
174 ; pi. xiii. 
Spermophilus lateralis, F. Cuv. Suppl. Buffon, I, Mam. I, 1831, 335. 
Wagner, Suppl. Schreber Saugt. HI, 1843, 252. 
Aud. & Bach. N. Am. Quad. Ill, 1853, 62 ; pi. cxiv. 
Otospermophilus lateralis, Brandt, Bull. Phys. Math. Acad. St. Petersb. II, 1844, 379. 
Giebel, Saugt. 1855, 638. 
Sp. Ch. —Ears conspicuous ; high. Tail, with hairs, more than half as long as head and body ; depressed. Middle region 
of the back finely grizzled yellowish gray and black, without any lines ; on each side two distinct black stripes, enclosing a 
yellowish white one, all of about the same diameter. Posterior half of the thigh and rump dark chestnut brown, without 
stripes. Top of the head chestnut. Under surface of tail bright chestnut; margined with brownish yellow, within which 
is a black band. Length about 7 inches ; tail, with hairs, about 4; hind foot, from heel, 1.42 inches. 
This animal is about the size of the small red squirrel, ( Sciurus hudsonius ) or perhaps less, 
and in general appearance hears a strong resemblance to Tamias. The ears are quite broad and 
high, rounded at tip, and thin, fully equal in size to those of Tamias striatus; they are coated 
on both sides with short close hairs. The fore claws are hut little longer than the hinder ones, 
and are stouter at the base and more curved than usual among spermophiles. The thumb is 
obsolete, and provided with a short, broad nail, not a claw. The soles are entirely naked from 
the heel. The tail is short; the vertebral portion about half as long as the head and body ; it 
is rather broad and flattened. 
The most conspicuous feature of coloration consists in two broad stripes of black on each side 
of the hack, with a yellowish white line of equal width between each pair. These stripes ex¬ 
tend from the shoulders to the thighs, although there is an obsolete continuation of the light 
line to the base of the ear. There is no line on the median region of the back, this being of a 
finely grizzled yellowish and black. In the middle of the back this grizzled dorsal region is 
