LIST OF SPECIES. XLI 
Page. 
130. Dipodomys agilis, Gambel.—Fort Yuma and San Diego, Cal., to San Francisco... 414 
34. PEROGNATHUS, Maxim. 416 
a. Perognathus, Max. 417 
131. —Perognathuspenicillatus, Woodhouse.—Tuft-tailed Mouse.—San Francisco Moun¬ 
tains, New Mexico, to Fort Yuma, California, along Colorado... 418 
132. —Perognathus fasciatus, Pr. Max.—Fort Union, Nebraska, and Fort Riley, Kansas 
Territory, to Chihuahua. 420 
133. —Perognathus hispidus, Baird, (n. s.)—Matamoras. 421 
134. —Perognathus monticola, Baird, (n. s.)—St. Mary’s, Rocky Mountains. 422 
b. Cricetodipus , Peale. 418 
135. —Perognathus flavus, Baird, (n. s.)—Upper Missouri, along eastern slopes of Rocky 
Mountains to Sonora and Chihuahua; and along the Rio Grande to 
Matamoras. 423 
136. —Perognathus parvus, Leconte.—King’s River, California. (Oregon, Peale.). 425 
35. JACULUS, Wagler. 429 
137. —Jaculus hudsonius.—Jumping Mouse.—Nova Scotia, (Labrador, Pennant,) to 
Southern Pennsylvania, and west to the Pacific Ocean.. 430 
TRIBE MURES. 
36. MUS, Linnaeus. 436 
138. —Mus decumanus, Pallas.—Brown Rat.—Throughout North America. (Introduced.) 438 
139. —Mus rattus, L.—Black Rat.—Throughout North America. (Introduced.). 439 
140. —Mus teetorum, Savi.—White-Bellied Rat; Roof Rat.—Tar River North Carolina, 
to Georgia ; Northern Mexico. (Introduced.). 441 
141. —Mus musculus, Linn.—Common Mouse.—North America generally. (Introduced.) 443 
TRIBE SIGMODONTES. 445 
37. REITHRODON, Waterhouse. 447 
142. —Reithrodon humilis.—Harvest Mouse.—South Carolina and Georgia, to St. Louis? 448 
143. —Reithrodon montanus, Baird, (n. s.)—Rocky Mountains. Lat. 39°. 449 
144. —Reithrodon megalotis, Baird, (n. s.)—Sonora...... .. 451 
145. Reithrodon longicauda, Baird, (n. s.)—San Francisco and Petaluma, California.... 451 
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