98 



U. S. p. E. R. EXP. AND SUEVETS 47TH PARALLEL. 



SPERMOPHILUS DOUGLASSII. 



Columbia Ground Squirrel. 



Jlrctomys Spermophilus dovglassii. Rich. F. B. A. I, 1829, 172. 

 Spermophitus 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 haclc and sides. — Sides silvery from below the ears to false ribs. These 

 silvery patches are separated on the back by a dark stripe about | 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. 



Dimensions. — Male. 



Inches. 



Length from point of nose to insertion of tail 



insertion of tail to end of vertebras 



hair 



From tip of longest nail of hind foot to same of fore foot. . . 



Length of ear, measured posteriorly 



From heel to longest third nail of hind foot 



Between the eyes 



Length of head from occipital protuberance to end of nose. 



hand, including nail 



fur from middle of back 



12 

 3 

 9 



15 

 1 

 2 

 1 

 2 



1 



Lines. 



17| inches. 



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



Dimensions. — Nose to insertion of tail, 10| inches. End of caudal vertebrie. 

 End of hair, 19f inches. 



SPERMOPHILUS TRIDECEM-LINEATUS. 



striped Prairie Squirrel. 



Sciurus tridecem-Uneatus, Mitchell, Medical Repository, XXI, Jan. to June, 1821, 248. 

 Spennophilus tridecem-lineahis, Aud k Bach. N. Am. Quad. I, 1849, 294 ; pi. xxxix. 

 Eaird, Gen. Rep. Mammals, 1857, 316. 

 Sp. Ch. — About the size of Sciurus hudsonius. Ears very short. Tail vertebrae about half the length of body, or a little 

 longer. Claws long ; that of tliumb 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 margiu 

 and tip, and within this a border of black. Length, 5 to 6 inches. Tail vertebraa, 3.50 to 4 inches. Hind foot 1.30 to 1.40. 



Minewakan, Minnesota, and the upper Missouri. 



