280 
U. S. P. R R. EXP. AND SURVEYS—ZOOLOGY-GENERAL REPORT. 
1. Species described as North American by Audubon and Bachman. 
Sciurus colliaei, Richardson. Hah. San Bias, Mex. 
Sciurus colliaei, Rich. Zool. of Blossom, 1839, 8 ; pi. i. 
Bachman, Pr. Zool. Soc. Lond. VI, Aug. 1838, 95, (named, but not described.) —Ib. Charlesworth’s 
Mag. N. H. Ill, 1839, 334,— Ib. Sill. Am. Jour. Sc. XXXVII, 1839, 307. 
Wagner, Suppl. Schreb. Ill, 1843, 174. 
Aud. & Bach. N. Am. Quad. Ill, 1853, 21 ; pi. civ. 
Size of Sciurus carolinensis; tail about as long as the body. Above grizzled with black and 
dull yellow. Sides of muzzle, under parts of body, and inner sides of limbs dull white. Tail 
moderate, the hairs grayish white, three times annulated with black. Back of ears grizzled 
with black and yellow, posteriorly covered with long whitish hairs. Legs and feet dirty cream 
color, pencilled with dusky. Nose to root of tail, lOf inches ; tail to end of hairs, 9J ; hind 
foot from heel, 2 T \ inches. 
This species, as avowedly coming from the west coast of Mexico, has no claim whatever to a 
place in the fauna of the United States. It appears to resemble, in some respects, the small 
gray squirrel described from Santa Caterina, Mexico, under the head of Sciurus carolinensis ? ? 
page 263. 
Sciurus mustelinus, Aud. & Bach. Hah. California. 
Sciurus mustelinus, Aud. & Bach. Pr. A. N. Sc. Phila. I, Oct. 1841, 32 — Ib. Jour. A. N. Sc. Phila. VIII, n, 1842 
312.— Ib. N. Am. Quad. Ill, 1854, 258; pi. cliii, fig. 1. 
11 Neck very long ; tail longer than the body ; hair, short, rigid, glossy ; the whole body jet 
black. Length to root of tail, 10 inches ; of tail, (with hairs ?) 13 inches ; height of ear, 6 
lines ; hind foot, 2 T \ inches.” 
This species in many respects resembles Spermophilus couchii, hut we are assured that it is a 
true squirrel. 
Sciurus nigrescens, Bennett. Hab. Lower California. 
Sciurus nigrescens, Benn. Pr. Zool. Soc. Lond. I, 1833, 41. 
Bachman, Pr. Zool. Soc. Lond. VI, 1838, 96.— Ib. Charles. Mag. N. H. Ill, 1839, 334,— Ib. Sill. 
Am. Jour. Sc. XXXVII, 1839, 306. 
Wagner, Suppl. Schreb. Ill, 1843, 174. 
Aud. & Bach. N. Am. Quad. Ill, 1853, 741; pi. cxvii. 
Dusky, slightly grizzled on the body with gray ; sides dusky yellow ; beneath dingy gray; 
tail much longer than the body, nearly cylindrical, the hairs broadly tipped with white. 
Length to root of tail, 12 t 4 j inches ; tail to end of hairs, 15 x 4 j; hind foot, 2 X 8 2-. 
Sciurus lanigerus, Aud. & Bach. Hab. Northern California. 
Sciurus lanigerus, Aud. & Bach. Pr. Ac. N. Sc. Phila. I, 1841, 100.— Ib. Jour. Ac. N. Sc. Phila. VIII, ii, 1842,310.— 
Ib. North Amer. Quad. I, 1849, 214; pi. xxvii. 
“ Head all round, ears, and legs black. Fur on the back light plumbeous on the basal half, 
very beautiful, narrowed at base, then widening to middle, and diminishing to a point.” The figure represents the tail as 
rather cylindrical, and with the hairs, rather shorter than the head and body. 
This animal has, by some, been referred to as a spermophile, though with no definite reason. I know of no permanent 
variety of squirrel resembling this description at all. It has much the characters, in part, of an albino. At any rate, there 
is little doubt that no such animal inhabits western North America as a distinct and true species. 
