70 NEW-YORK FAUNA. 
(EXTRA-LIMITAL.) 
A. empetra. (Ricuarpson, pl. 9.) Hoary above, reddish orange beneath; cheeks whitish. Tail 
brown and hoary, with a black tip. Size of monax. Northern Regions. 
A. pruinosus. (RicHARDSON, p. 150.) Long coarse fur, especially on the back and shoulders, where 
it is hoary; hind parts dull yellowish brown. ‘Tail bushy, blackish brown. Size of preceding. 
Rocky Mountains. 
A. brachyurus. (Haruan, p. 304.) Above brownish grey tinged with red, and speckled with lighter ; 
nose, feet and under side of body brick red. Tail flat, red above, with a white margin. Length 
17-0. Tail 2°5. Columbia River. 
FAMILY II. GERBILLIDA. 
> « 
Fore feet very short. Hind feet disproportionately long. Tail generally longer than the 
body. Molars with tubercular crowns, 6 — 8 beneath. 
Oss. This forms a small but distinct grou comprising at present about ten species 
to) 2 t= ? 
included under three genera. 
GENUS MERIONES. Illiger. 
Consisting of small species. Tail very long, slender, and nearly naked. Molars beneath 
six. Fore feet with a rudimentary thumb, with a small nail. Hybernate. Nocturnal. 
THE DEER-MOUSE. 
MERIONES AMERICANUS. 
PLATE XXIV. FIG. 2.—(STATE COLLECTION.) 
Labrador Rat. PENn. Arct. Zool. Vol. 1, p. 132. 
Dipus americanus. Barton, Am. Philos. Trans. Vol. 1, p. 114, figure. - 
D. canadensis. Davis, Lin. Trans, Vol. 4, p. 155, pl. 8, figs. 5 and 6. 
Gerbillus canadensis et labradorius. Haran, -Fauna Am. p. 155. Gopman, Am. Nat. Hist. Vol. 2, p. 94, figure. 
Meriones labradorius. Ricnarpson, F. B. A. Vol. 1, p. 144, pl. 7. 
Gerbillus canadensis. EZXMmons, Mass. Report, 1840, p. 69. 
Characteristics. Dark reddish brown above, yellowish on the sides ; beneath whitish, tinged 
with yellow. Length 8:0 -9°0. 
Description. Head narrow, conical, with a small projecting black muzzle covered with 
short rigid hairs, leaving a naked space about a tenth of an inch wide. Nostrils small, oval 
and lateral. Mouth beneath. Whiskers long and black, extending to the ears, and even 
beyond them, with a few scattering hairs before the eyes. Ears suboval, nearly a quarter of 
an inch long. Eyes very small. Fore feet feeble, 0+5 long, with four white, sharp, com- 
