292 
U. S. P. R. R. EXP. AND SURVEYS-ZOOLOGY-GENERAL REPORT. 
zygomatic plate, not anterior to it; the zygoma without an angular bend ; molars four, not 
five ; incisors narrow and squirrel-like, &c. From Sciurus it is distinguished by the more 
depressed and elongated skull; the perforation of the zygomatic plate ; the great obliquity of 
the planes of the molars ; the straight zygoma ; the elevated and lengthened coronoid process 
of the lower jaw, &c. The notch of the posterior edge of the zygomatic plate of the maxillary 
is opposite the first anterior molar in Tamias, instead of the third as in Spermophilus. 
TAMIAS STRIATUS. 
Chipping, Striped, or Ground Squirrel; Chipmunk. 
Sciurus striatus, Linnaeus, Museum Adolphl Frederici Regis, I, 1754, 8. (Based entirely on an American speci¬ 
men.)— Ib. Systema Naturae, (ed. 10th,) I, 1758, 64.—In. Syst. Nat. (ed. 12th,) I, 1766, 87. 
Schreber, Saugthiere, IV, 1792, 791; pi. ccxix. (Figure a little altered from Catesby.) 
Harlan, Fauna Americana, 1825, 183. 
Godman, Am. Nat. Hist. II, 1831, 142. 
Dekay, New York Zool. I, 1842, 62 ; pi. xvi, fig. 1. 
Myoxus striatus, Boddaert, Elenchus Animalium, I, 1784, 122. 
Sciurus striatus americanus, Gmelin, Syst. Nat. I, 1788, 150. 
Fischer, Synopsis, I, 1829, 348. 
Tamias striatus, Baird, 11th Rep. Sm. Inst. 1857, p. 55. 
Kennicott, Rep. U. S. Pat. Office for 1856, Agricultural, (1857,) 70 ; pi. riii. 
lamias americana, Kchl, Beitrage zur Zoologie, 1820, 69. (Specimen in Bullock’s Museum.) 
Sciurus americanus, Fischer, Synopsis, 1829, 349. (From preceding.) 
Sciurus ( Tamias ) lysleri, Richardson, F. B. Am. I, 1829, 181; pi. xv. 
Doughty’s Cabinet Nat. Hist. I, 1830, 169 ; pi. xv. 
Sciurus lysteri, Wagner in Schreber Siiugt. IV ; pi.- ccxiv, C. (Figure only.) 
Tamias lysteri, Schinz, Synopsis Mam. II, 1845, 47. 
Aud. & Bach. N. Am. Quad. I. 1849, 65 ; pi. viii. 
Sciurus a Cla. Dean. Lyster dbservatus, Ray, Synopsis Quad., 1693, 216. 
The ground squirrel, Catesby, N. H. Carolinas, H, 1731, 75; pi. lxxv. (In part.) 
Ecureuil de Caroline, Brisson, R. An. (Quadrup.) 1756, 155. 
Ground squirrel, Pennant, Synopsis Quad. 1771, 288. 
Church, Cabinet of Quad. H, 1805 ; plate. 
Striped dormouse, Pennant, Hist. Quad. 1781, No. 286.— Ib. Arctic Zoology, I, 1781, 126. (Specimen in Leverian 
Museum.) 
Sp. Ch. —Tail to end of tho hairs shorter than the body ; to end of vertebra about three-fifths the length of the body 
Ba< k and sides with five longitudinal black stripes, which do not extend over the rump ; the two outer on each side close 
together, separated by a white line ; the middle or dorsal stripe with a wide interval on each side of a finely grizzled 
yellowish gray and brown, like that on the upper parts generally. Dark lines bordered with chestnut brown. Rump pale 
chestnut. Body 5 to 6 inches ; tail, with hairs, 4 to 4J inches ; hind foot 1. 40 inch. 
Description from a freshly-killed specimen, No. 842.—Body rather stout and somewhat depressed. 
Neck thick, almost as broad as the head. Forehead arched, snout not very acute. Muffle 
covered with hairs on the upper part, so that no naked skin is visible when the head is viewed 
from above. The fissure in the upper lip is continued to the shallow furrow separating the 
nostrils, which are coated with hairs to their very margin, though their septum is naked. 
The lips are tumid, the mouth opening directly upon the naked palate. Palate with a triangular 
callosity posterior to the incisors, and behind this are eight transverse ridges, the first three in 
