ZOOLOGY. 127 



hunting grounds, where the hunters frequently suffer severe injuries from their horses falling 

 after treading on one while at full speed. 



At Fort Dalles the Columbia gopher is also quite abundant. I obtained many specimens 

 during the spring of the year, which had been turned up in ploughing. S. 



DIPODOMYS PHILLIPII, Gray. 



Kangaroo Rat. 



BAIIID, Gen. Eep. Mammals, p. 412. 



The kangaroo rat is quite common on Salmon river, a branch of the Klamath. 



While crossing the &quot;Plains&quot; in 1849 I killed, near the Platte river, a small animal belonging 

 to the rat family, resembling the jerboa in the length of its hind legs. G. 



Dr. Cooper thinks that this was probably the D. ordii, which is very common at Fort 

 Laramie, on the Platte, where he obtained several specimens in 1857. 



The only specimen of this Dipodomys which I obtained in Oregon is the one mentioned in 

 my partial report, chapter 2 of this volume. It is called sim-tup-tup by the Walla-Wallas, and 

 is said by them to be abundant in the berry patches on the slopes and foot-hills of the Blue 

 mountains of Oregon. S. 



JACULUS HUDSONIUS, Baird. 



Jumping Mouse. 



[See chap. 2, p. 101.] 



The jumping mouse is very abundant in the vicinity of Puget Sound. I obtained several 

 specimens in our camp on Muckleshoot prairie, about 20 miles from the sound. A temporary 

 flooring of boards having been laid in our tents, it was not long before these little creatures 

 availed themselves of the advantages thus furnished for a comfortable residence. In habits, 

 food, &c., they much resemble the small field mice and their relatives. S. 



HESPEROMYS GAMBELII, Baird. 



Gambel s Mouse. 



[See chap. 2, p. 102.] 



Gambel s mouse was obtained by me at Fort Dalles, 0. T., where it is considered a great 

 pest, both by whites and Indians, on account of its passion for cutting and gnawing holes in 

 blankets, shawls, clothing, and all sorts of woollen fabrics. It is almost impossible to secure 

 such articles from the attacks of these little animals. The individual obtained by me, whose 

 skin is now carefully preserved in the Smithsonian collection, gained his present obituary and 

 scientific distinction by gnawing an enormous hole in the middle of a new uniform coat belonging 

 to a brother officer, having surreptitiously gained access to a chest of drawers supposed to 

 have been mouse -proof. S. 



HESPEROMYS AUSTERUS, Baird. 

 White-bellied Mouse. 



BAIRD, Gen. Eep. Mammals, 4C6. 



The white-bellied mouse is met with at a very high elevation in the Cascade mountains, as 

 well as upon the Nisqually plains, which are not more than 200 feet above the level of the 

 sea. G. 



