136 



30. Dipodomys ordii, Woodhouse. — Kangaroo Rat. — Platte river, 

 along the eastern slope of the Rocky mountains, into Durango and 

 Coahuila, Mexico, — A single specimen was taken on the Niobrara 

 river. 



31. 3Ius musculus, Linn. — Common Mouse. — North America gene- 

 rally. (Introduced.) — Abundant at all the fur trading posts on the 

 Missouri. 3Ius rattus or common rat is also introduced. 



32. Hesperomys sonoriensis, Leconte. — Upper Missouri, and Rocky 

 mountains to El Paso and Sonora. — Very abundant near Fort Union 

 and along the Yellowstone. Twenty-five specimens collected. 



33. Hesperomys leucogaster. — Missouri Mouse. — Plains along the 

 upper Missouri. — Very rare ; but two specimens secured ; one near 

 Bijox Hills, the other on Vermilion prairie, and are the only speci- 

 mens in the museum of the Smithsonian Institution. 



34. Neotoma cinerea. — Rocky Mountain Rat. — Eastern slope of 

 northern Rocky mountains and upper Missouri. — Not rare, but seldom 

 captured ; usually found among the dry trees on the river bottoms. 

 The only specimen secured was taken at Fort Sarpy, near the mouth 

 of the Big Horn river, on the Yellowstone. 



35. Arvicola Uaydeni, Baird, (n. s.) — Fort Pierre, Nebraska. — But 

 one specimen of this species has ever been detected. 



36. Lepus campesh'is, Bach. — Prairie Hare. — Upper Missouri and 

 Saskatchewan plains to the Cascade Range of Oregon. — This hare, 

 though not extremely abundant, is not uncommon in the northwest, 

 from the mouth of Niobrara river to the mountains. Four specimens 

 were collected on the Yellowstone. 



37. Lepus sylvaiicus, Bach. — Gray Rabbit. — From Massachusetts 

 throughout the United States, as far as Indianola, Texas ? and west 

 to the Missouri, as far as Fort Union, Nebraska. — Found all along 

 the Missouri river to the mountains, but mostly confined to the wooded 

 bottoms of the rivers and streams. Eight specimens are in the collec- 

 tion of the expedition. 



38. Lepus artemisia, Bach. — Sage Hare. — Regions west of the Mis- 

 souri to the Rocky mountains, and to the Cascade mountains of Ore- 

 gon, along the Columbia on the north, and to the city of Chihuahua 

 on the south. — Abundant in the Bad Lands and on the Sage plains 

 of the upper Missouri river. Five specimens were obtained by the 

 expedition. 



39. Cervus canadensis, Erxl. — American Elk. — Northern portions 

 of United States to upper Missouri, and west to the Pacific. Found 

 in the Alleghenies of Pennsylvania and Virginia. (North to 57^, 

 Rich.) — Most abundant in the valley of the Yellowstone and along 

 the Missouri river above Fort Union. Not rare, though less abundant 

 as low down the Missouri as Council Bluffs. The collection contains 

 two pairs of skins, two of skeletons, with numerous separate skulls, 

 and about twenty pairs of antlers. 



40. Cervus leucurus, Douglass. — White-tailed Deer. — Upper Mis- 

 souri and Platte to the Columbia river and Washington Territory. 

 Western Texas and New Mexico ? — Very abundant along the riter 

 bottoms ; most common from Council Bluffs to Fort Pierre. Foic 

 skins, with numerous separate skins and antlers, were obtained. 



