98 
U. S. P. R. R. EXP. AND SURVEYS-47TH PARALLEL. 
SPERMOPHILUS DOUGLASSII. 
Columbia Ground Squirrel. 
Arctomys Spermophilus douglassii, Rich. P. B. A. I, 1829, 172. 
Spermophilus douglassii, F. Cuvier, Suppl. Buff. I, Mamm. 1831, 333. 
Aud. & Bach. N. Am. Quad. I, 1849, 373 ; pi. xlix. 
Baird, Gen. Rep. Mammals, 1857, 309. 
Sp. Ch. —Similar in most all respects to S. beecheyi, but with the space on the nape and back, between the light colored 
more lateral patches, of a uniform dark brown, nearly black. 
Fort Dalles, 0. T., January and April, 1855.—(39, 52.) 
39. Squirrel or marmot, called at Fort Dalles the rock squirrel; Indian name, woskee. (Walla- 
Walla.) Ears extremely fulvous, with scattering, long, hlack hairs; inside well covered with 
pale hrown, darker near the tip; anterior edges, extremely darkhrown; posterior, pale. Eyelids, 
white. Face, brownish white, the hairs posteriorly becoming varied. Chin and fore thoat, 
brownish white, becoming more foxy on the breast. The hairs of the latter are dusky at the 
base. 
General aspect of bach and sides .—Sides silvery from below the ears to false ribs. These 
silvery patches are separated on the hack by a dark stripe about f of an inch in width, along 
the middle from the forehead, running posteriorly to the posterior half of the body, where it 
becomes expanded into the general hrown color of those parts. The whole is varied with 
irregular whitish and hrown wavy lines, their interspersions giving in certain lights a mottled 
appearance. Tail, brownish white, each hair with 3 black bars. Inside of legs fulvous. They 
are exceedingly numerous about the Dalles, become very fat, and are excellent eating. 
Dimensions. — Male. 
Inches. 
Lines. 
Length from point of noso to insertion of t3.il* ••••••••••••••••••••••••• 
12 
insertion of tail to end of vertebra? ..*•••••••••••••••••••» 
3 
3 
9 
6 
From tip of longest nail of bind foot to same of fore foot* ••••••••••••••• 
15 
9 
Length of ear, measured posteriorly.. 
1 
2 
From heel to longest third nail of hind foot «•••••■•••••••••••••••••••• 
2 
6 
Between the eyes*•••••••••••••*••••••••••••••••••••••••••••••••••• 
1 
2 
7 
hand, including nail*••••••*»••••••••••••••••••••••••••••• 
1 
6 
fur from middle of back •••••••••••••*•••••••••••••••»••••* 
7 
Female .—April 7, 1855, No. 52.—Five teats on each side. 
Dimensions .—Nose to insertion of tail, 10| inches. End of caudal vertebrae, 17f inches. 
End of hair, 19f inches. 
SPERMOPHILUS TRIDECEM-LINEATUS. 
Striped Prairie Squirrel. 
Sciurus tridecem-lineatus, Mitchell, Medical Repository, XXI, Jan. to June, 1821, 248. 
Spermophilus tridecem-linealus, Aud &. Bach. N. Am. Quad. I, 1849, 294 ; pi. xxxix. 
Baird, Gen. Rep. Mammals, 1857, 316. 
Sp. Ch.—A bout the size of Sciurus hudsonius. Ears very short. Tail vertebrae about half the length of body, or a little 
longer. Claws long ; that of thumb rather diminutive. Above dark brown, with light stripes and lines of light spots alter¬ 
nating with each other, six of the former and five of the latter generally very distinct. Tail with a brownish yellow margin 
and tip, and within this a border of black. Length, 5 to 6 inches. Tail vertebrae, 3.50 to 4 inches. Hind foot 1.30 to 1.40. 
Minewakan, Minnesota, and the upper Missouri. 
