122 
Gents ARctToMys Schreber. 
Etymology: Arktos—bear ; Mus—mouse. 
1758. Mus, Linn. (in part), Syst. Nat., i, and early authors. 
1777. Glis, Erxl., Syst. Reg. Anim., 1777, 358 (in part). 
1778. Mures soporost, Pallas, Nov. Spec. Glires, 1778, 74. 
1792. Arctomys, Schreber, Saugt., iv., 1792, 720 Gin part). 
1825. Arctomys, F'. Cuvier, Dents des Mamm., 1825, 159, 254, pl liv (based 
on Arctomys alpinus, Linn.,” and ‘‘ Arctomys empetra,” Pall. 
Generic Characters—Skull with dorsal outline nearly straight; frontal 
region flat or depressed ; post-orbitals triangular at base, with a long, de- 
curved point; zygomatic arches moderately extended, not widening and 
diverging posteriorly; grinding teeth rather small, the transverse and 
antero-posterior diameters about equal, and the molar series very nearly 
parallel; ante-orbital foramina sub triangular under and below, but not 
thrown outward. Size large; body thick set, depressed ; cheek pouches 
small; tail rather short, bushy, and flattened; ears small; nail of pollex 
broad, flat, or wanting; pelage with long, coarse hairs and thick under 
fur. Coloration generally yellowish-gray, without either distinct spots 
or stripes. This genus includes the largest members of the Sciuridz, and, 
excepting the Beaver, the largest of existing North American rodents. 
Besides the species belonging to’ the fauna of Ohio, two species, A. 
flaviventer and A. pruinosus, occur in the west and northward. The latter 
is twice thé weight and bulk of A. monax; the former is more nearly 
allied to A. monaz, but has smaller ears and larger tail, aside from strongly 
marked skeletal differences. 
The habitat of Arctomys monax extends from the Carolinas northward 
to Hudson’s Bay and Liard River, and westward from the Atlantic coast 
to western Missouri, lowa, and Minnesota. 
ARCTOMYS MONAX (Linn.) Schreb. 
Woovcxruck; Ground Hog; Marmor. 
1758. Mus monax, Linn. Syst. Nat., 10th ed., i, 1758, 60.—Pallas, Nov. 
Spec. Glires, 1778 Gin part only).—Boddaert, Wlench. Anim., i, 
1784, 105. 
1777. Glis monaz, Wrxl., Syst. Anim., 1777, 361. 
1792. <Arctomys monaz, Gohrenene Siugt., iv, 737.—Shaw, Gen. Ton vl, 
1808, 117.—F. Cuvier, Dict. des Sci. Nat., xxix, 1823, 162.— 
Sabine, Trans. Linn. Soc., xiii, 1822, 582.—Harlan, Fauna 
Amer., 1825, 158.—Godman, Amer. Nat. Hist., ii, 1826, 100,— 
