300 



U. 8. P. R. R. EXP. AND SURVEYS ZOOLOGY GENERAL REPORT. 



TAMIAS DORSALIS. Baird. 



Gila Striped Squirrel. 



Tamias dortalis, BAIKD, Pr. Acad. Nat. Sc. Phila. VII, April, 1855, 332. 



g p< C H sides of head with the usual stripes of Tamias, but very distinct and well defined. Above, hoary mixed with 



rusty and brown ; beneath, dull white. Sides and buttocks dull rusty. A single distinct dorsal dark stripe ; the others 

 usually seen in the genus being obsolete, except the exterior light stripe, which is somewhat distinct. Tail, with the 

 vertebra half the length of body ; the hairs unusually long, black, and chestnut, largely tipped with white. 



Body about five inches ; tail sensibly shorter. Hind foot 1. 25 inches. 



This species is readily distinguishable from all others by the single dorsal stripe, the others 

 being obsolete. The more bushy tail, with its conspicuous markings of chestnut, black, and 

 white, is also highly characteristic of it. 



A more detailed description will be found in the report of the United States Mexican 

 Boundary Survey. 



List of specimens. 



TAMIAS TOWNSENDII. 



Townsend's Striped Squirrel. 



Tamias totcnsendii, BACHMAN, Jour. Phila. Acad. Nat. Sc. Phila. VIII, i, 1839, 68. IB. in Townsend's Narrative, 

 1839, 321. 



WAGNER, Wiegmann's Archiv. 1843, u, 44. 



AUD. & BACH. N. Am. Quad. I, 1849, 159 ; pi. xx. 

 Tamias hindsii, GRAY, Annals & Mag. N. H., X, 1842, 264. ' IB. Zool. of Sulphur, 1844, 34 ; plate xiii, fig. 1. 



(California.) 

 Tamias cooperii, BAIRD, Pr. Ac. Nat. Sc. Phila. VII, April, 1855, 334. 



SP. CH. Larger than T. strialus. Tail, with hairs, nearly or quite as long as the body. Sides of head striped. Above 

 and on the sides rufous brown, with five dark stripes reaching to the tail, the intervals between which are scarcely or but 

 seldom paler than the ground color ; beneath, dull white. Ears dusky brown, hoary posteriorly. Tail bright chestnut 

 beneath, margined with ashy white, within which is a band of black. Length 5 to 6 inches. Hind foot 1. 40 to 1. 50. 



Varies in rather paler colors, ash-colored interspaces, and sometimes the back with black hairs interspersed, so as to 

 obscure or nearly conceal the dorsal stripes. 



Description of typical specimens from near the mouth of the Columbia river. In size T. town- 

 sendii exceeds all other species of Tamias in this country. It has the same general characteristics 

 as the rest. The ears are moderate and well coated with hairs, but not tufted. The two middle 

 fingers are longest, the inner longer than the outer ; palms naked. On the hind foot, the 

 fourth and third toes are longest, and nearly equal ; the second very little shorter ; the fifth, 

 or exterior, does not reach the base of the claw of the fourth ; the first bears the same relation 



* ' Rufous brown, with three close black streaks, outer -edged with a white streak. Feet rusty brown. Tail hairs red 

 at base, with a black subterminal band. Head and body 5J inches, tail 4 J." 



