98 U. S. P. R. R. EXP. AND SURVEYS 47TH PARALLEL. 



SPERMOPHILUS DOUQLASSII. 



Columbia Ground Squirrel. 



Jlrctomys Spermophilus douglassii, RICH. F. 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, black hairs ; inside well covered with 

 pale brown, darker near the tip ; anterior edges, extremely dark brown ; 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 back and sides. Sides silvery from below the ears to false ribs. These 

 silvery patches are separated on the back 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 brown color of those parts. The whole is varied with 

 irregular whitish and brown 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. 



D intensions . Male . 



Female. April 7, 1855, No. 52. Five teats on each side. 



Dimensions. Nose to insertion of tail, 10 inches. End of caudal vertebras, l*7f 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 tridectm-linealus, AUD &. BACH. N. Am. Quad. I, 1849, 294 ; pi. xxxix. 



BAIRD, Gen. Rep. Mammals, 1857, 316. 



Sp. CH. About the size of Sciurus hudsonius. Ears very short. Tail vertebrfe 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 liglit spots alter 

 nating with each other, six of the former and five of the latter generally very distinct. Tail with a brownish yellow margiu 

 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. 



