16 
ZOOLOGY. 
ARVICOLA. 
Three specimens of arvicola were caught at Camp 94, New Year Spring. Here was a luxu¬ 
riant growth of gramma grass ( Boutelorea ) both in the valley and on the hill sides. On the 
latter places were many loose fragments of volcanic rocks, of various sizes, scattered about, but 
not in such quantities as to interfere materially with the growth of the grass. Here they built 
their nests under the stones, and constructed them of dry grass in a manner similar to those of 
the eastern meadow mouse, (Arvicola riparius ,) and like this animal had paths under the 
grass diverging in every direction from the hole. In general appearance they resembled the 
above mentioned species, hut were decidedly smaller. The specimens were all lost on the 
Isthmus. 
ERETHIZON EPIXANTHUS, Brandt.—Yellow-haired Porcupine. 
Eretliizon epixanthus, Brandt, Mem. Acad. St. Petersburgh, 1835, 389, 416; tab. i, Animal; tab. ix, fig. 1—4, 
skull. — Ib. Mamm. exot. 55, (same as preceding.) 
Waterhouse, N. H. Mamm. II, 1848, 442. 
Baird, Gen. Rep. Mammals, 1857, 569. 
S,.. Ch.—G eneral color dark brown, nearly black ; the long hairs of the body tipped with greenish yellow. Nasal bones nearly 
one-half or two-fifths the length of upper surface of the skull. 
We found this singular animal only on the Little Colorado river. Our marches along that 
stream were made during the month of December. At that season we found it frequently 
feeding upon the tender branches of the cottonwood trees. We observed it in no other position. 
When approached it drew itself into a bunch and remained quietly and without moving as 
long as we remained near. The hollows in the large cottonwood trees along the stream afforded 
them good breeding places. 
LEPUS CALLOTIS, Wagler.—Jackass Rabbit ; Texas Hare. 
Lepus callotis, Wagler, Nat. Syst. Amph 1830, 25 . — Ib. Isis, 1831, 511. 
Aun. & Bach. N. Am Quad. II, 1851, 95; pi. Ixiii. 
Baird, Gen. Rep. Mammals, 1857, 590. 
Sp. Ch.—R ather smaller than the European hare. Ears very long and broad; nearly one-third loDger than the head and 
one-fifth longer than the hind foot. Hair on the buttocks short and close Color above, yellowish gray, blotched and lined with 
black. Upper surface of tail and central line of rump, black; tail beneath, grayish white. Sides of rump, clear ash gray. 
Legs, ashy. Nape, black, (sometimes whitish ?) Beneath, dull whitish, with a yellowish brown color on the throat. A light 
ring round the eye. Tip of the posterior surface of the ear black. 
A specimen of this species was obtained at Fort Clark, New Mexico. Its ears are longer 
than those of any other L. callotis I have seen, and it may belong to L. texianus, although the 
condition of the skin is not sufficiently perfect to decide the question. 
LEPUS ARTEMISIA, B ach.— Sage Rabbit. 
Baird, Gen. Rep. Mammals, 1857, 602. 
Several specimens of this species were obtained on the plains of Texas ; one (No. 6) in the 
Sierra Madre, New Mexico, and another (108) at Camp 99, Picacho mountains, New Mexico. 
