174 NORTHERN ZOOLOGY. 
ringed alternately with black and white, and, lastly, tipped with white. There are three black 
rings on each hair, and the one next to the white tip is considerably broader than the others. 
The hairs are equally long on all sides of the tail, which has, therefore, a cylindrical form; 
but if the animal is capable of giving them a distichous direction, there will then appear four’ 
white stripes, and three black ones on each side of its vertebree, of which the exterior of the 
black ones will be the broadest, and the whole tail will havea white border. The whiskers are 
black, and are shorter than the head. The external ears have a semi-ovate form, and are well 
clothed on both sides with short hair. The margins fold in at their base like the ears of a 
squirrel, or like those of A. Beecheyi. 
The feet are shaped like those of the other spermophiles; the hind soles, for more than 
half their length from the heels, are thickly clothed with hair. The, claws are black. The 
thumb-nail very much resembles that of A. Beecheyi, but the thumb isnot quite so large and 
distinct as in that animal. 
DIMENSIONS. 
Inches. Lines: Inches. Lines. 
Length of the head and body : . 13 G6 | Length of middle fore-claw . Ee!) 4} 
3 head é é C 2 7 5, from the heel to the tip of the middle 
25 tail (vertebre) 4 “ oO 9 hind-claw ; 3 3 tye I 
3 >» wWithfur . é q 3 Height of the ear, measured posteriorly . 0 6 
[55.] 12. Arctomys (SpERMopuitus) LaTERALIS. Say’s Marmot. 
Small Gray Squirrel. Lewis and Crark, vol. iii. p. 35. 
Sciurus lateralis. Say, Long’s Ewxped., vol. ii. p. 235 (vol. ii. p. 46. Amer, edit.) Hartan, Fauna, p. 181. 
The Rocky Mountain Ground Squirrel. Gopman, Nat. Hist., vol. ii. p. 144. 
Arctomys (Spermophilus) lateralis. Ricuarpson, Zool. Journal, vol.ii. No, 12, p.519. April, 1828. 
A. SPERMOPHILUS (/ateralis), lined in utroque latere luteo-albt nigro marginata. 
Say’s Marmot, with a yellowish-white stripe, bordered with black, on each flank. 
PLateE xtit. 
This animal is an inhabitant of the Rocky Mountains, and the first notice of it 
occurs in Lewis and Clark’s memorable expedition to the Pacific Ocean. Mr. Say 
first described it, and placed it among the squirrels in the sub-genus éamias. I 
have, however, removed it to M. Frederick Cuvier’s sub-genus spermophilus, on 
