LIST OF SPECIES. 
XLIII 
Tage. 
163. —Neotoma micropus, Baird, (n. s.)—Black Wood Rat.—Lower Rio Grande of 
Texas and Mexico..... 492 
164. —Neotoma fuseipes, Cooper, Mss., (n. s.)—Brown-Footed Rat.—Santa Clara to 
Petaluma, Cal.... 495 
165. —Neotoma occidentals, Cooper, (n. s.)—Hairy-Tailed Rat.—Mouth of Columbia, 
and Puget’s Sound.-. 496 
166. —Neotoma cinerea.—Rocky Mountain Rat.—Eastern slope of northern Rocky 
Mountains, and upper Missouri... 499 
166. *—Neotoma magister, Baird, (n. s.)—Carlisle Bone Cave, Pemnsylvania. Fossil. 
40. SIGMODON, Say & Ord. 500 
167. —Sigmodon hispidus, Say & Ord.—Cotton Rat.—Southern Atlantic and Gulf 
States. 502 
168-—Sigmodon berlandieri, Baird, (n. s.)—Texas Cotton Rat.—Texas. 504 
41. ARYICOLA, Lacep. 509 
a. Hypudaeus , Keys. & Bias. 
169. —Arvicola gapperi, Vigors.—Red-Backed Mouse.—Nova Scotia, Massachusetts, 
Canada, and Lake Superior. 518 
b. Herniotomys, Selys. 
170. —Arvicola riparia, Ord.—Bank Mouse.—Northern and Middle States. 522 
171. —Arvicola breweri, Baird, (n. s.)—Gray Mouse.—Muskeget Island, Mass. 525 
172. —Arvicola rufidorsum, Baird, (n. s.)—Holmes’ Hole, Mass. (Martha’s Vineyard.) 526 
173. —Arvicola townsendii, Bachman.—Washington & Oregon. 527 
174. —Arvicola montana, Peale.—Cascade Mountains, Oregon & California; Western 
Nebraska?. 528 
175. —Arvicola longirostris, Baird, (n. s.)—Cascade Mountains, Cal. 530 
176. — Arvicola edax, Leconte.—Monterey to San Diego, Cal. 531 
177. —Arvicola californica, Peale.—California. 532 
178. —Arvicola occidental^, Peale.—Puget’s Sound. 534 
179. —Arvicola modesta, Baird, (n. s.)—Sawatch Pass, Rocky Mountains. 535 
c. Chilotus, Baird. 516 
180. —-Arvicola oregoni, Bachman.—Steilacoom, W. T., to Tomales Bay, Cal. 537 
d. Pedomys, Baird. 517 
181. —Arvicola austera, Leconte.—Prairie Meadow Mouse.—Wisconsin to Louisiana... 539 
