82 
U. S. P. E. E. EXP. AND SURVEYS—EOUTE TO CALIFOEN1A. 
Sp. Cii. —Size of the cat-squirrel, S cinereus. Ears large, prominent. Tail more than two-thirds as long as the body. 
Above, mixed black, yellowish brown, and brown in indistinct mottlings; beneath, pale yellowish brown. Sides of head and 
neck, hoary yellowish, more or less lined with black, a more distinct stripe of the same, from behind the ears on each side, 
extending above the shoulders to the middle of the body. Ears black on their inner face. Dorsal space between the stripes 
scarcely darker than the rest of the back. Length,9 to 11 inches; tail, with hairs, 7 to 9. Hind feet, 2 to 2.20 inches. 
Specimens (A. and B.) were collected at tlie Tejon Pass, California. 
SPERMOPHILUS HARRISII, Aud. & Bach .—Harris’Squirrel. 
Spermophilus harrisii, Aud. & Bach. N. Am. Quad. Ill, 1854,267; pi. cliv, fig. 1.— Baird, Gen. Eep. Mammals, 1857, 313. 
Size rather less than that of Tamias striatus. Tail vertebrae about half the length of the body. Ears short, pointed. Soles 
hairy. Above, finely grizzled grayish, or whitish brown and black; under parts, and a stripe on each side, (without any black 
or dusky border,) whitish. Tail with one black and one light line, within the marginal whitish, black in the centre; uniform 
whitish beneath. Length, 5 inches; tail, with hairs, about 3. Hind foot, 1.45. 
A specimen (No. 3) was collected in the Mohave Desert. 
THOMOMYS BULBIYORUS, Baird .—California Gopher. 
? Diplostoma bulbivorum, Rich. F. B. Am. I, 1829,206; pi. xviii, B. (marked Diplostoma douglassi.) —Ib. Zool. of 
Blossom, 1839, 13. 
Thomomys bulbivorus, Baird, Gen Eep. Mammals, 1857, 389. 
Sp. Ch. —Cheek pouches large, completely furred inside, white to their very margin, which is dark brown, forming a very 
strong contrast. Tail from one-third to less than one-half the length of body; slender at base. Upper incisors quite convex 
transversely; groove obsolete. Hands small; claws very slender and delicate, nearly straight; middle claw 4£ lines, its under 
surface occupying about two-sixths the whole hand, its finger barely shorter than this; claw of thumb extending over two-fifths 
of whole hand. 
Color. —Eeddish chestnut brown above and on sides, finely lined everywhere by dusky tips to the hairs, without any uniform 
dark wash on the back. Beneath paler. Tail grayish white, except a short line of dusky along the base above. Chin dusky; 
its extremity white. 
Specimens collected at Tejon valley. (2.) 
DIPODOMYS PHILLIPPII, Gray .—Kangaroo Rat. 
Baird, Gen. Eep. Mammals, 1857, 412. 
Specimens of this species were collected at Posa creek. 
PEROGNATHUS PARVUS, Leconte. 
Cricetodipus parvus, Peace, Mamm. and Birds, U. S. Ex. Ex. 1848, 53. 
Perognathus parvus, Baird, Gen. Rep. Mammals, 1857, 425. 
Sp. Ch —Smallest known species of American rodent? Above, buff, mixed with dusky; beneath, white; entire fore leg white 
Tail rather longer than the body. Hind foot from heel nearly as long as the head. 
A specimen was collected on King’s river, California. (6.) 
HESPEROMYS GAMBELII, Baird .—California Mouse. 
Baird, Gen. Rep. Mammals, 1857, 464. 
The specimens of this species collected at Posa creek differed in some respects from those 
generally procured in northern California, in being smaller and darker colored. They are, 
however, possibly immature, which would account for the difference. (Nos. 4, 5, and 7.) 
