102 



U. S. P. B. R. EXP. AND SURVEYS 47TH PARALLEL. 



probably by the Hudson Bay Company s ships, and other merchant vessels. They are now exceed 

 ingly abundant in the storehouses of the Hudson Bay Company and the garrison. Before that, 

 the hairy-tailed rat was alone found. The Indians (Nisqually) have given it the hairy- tailed 

 rat s name, Squaivt hun, or large mouse. (No. 9.) 



HESPBROMYS GAMBELIT, Baird. 



BAIRD, Gen. Rep. Mammals, 1857, 464. 



SP. CH. Tail a little less or about equal to head and body. Above, yellowish brown, much mixed with dusky, but without 

 a distinct broad wash of darker on the back. Entire outside of fore leg, below the shoulders, white. 



Dalles, Oregon Territory, 1855. (42.) 



Dimensions. 



HESPEROMYS AUSTERUS, Baird. 



Oregon Mole. 



BAIRD, Gen. Rep. Mammals, 1857, 466. 



SP. CH. Sooty brown, slightly mixed with yellowish brown on the cheeks and lower part of sides ; the dusky color extending 

 to the wrist. Feet and under parts white. Tail well haired, as long as head and body ; lower half white. 



Many specimens of this species were obtained at Steilacoom. (4, 5, 22, 86.) 

 HESPEROMYS SONORIENSIS, Leconte. 



Hesperomys sonoriensis, LECONTE, Pr. A. N. Sci. Phila. VI, October, 1853, 413. (Sonora.) 



BAIRD, Gen. Rep. Mammals, 1857, 474. 



Jlrvicola (Hesperomys) sonoriensis, AUD. & BACH. N. Am. Quad. Ill, 854, 296 (from Leconte.) 

 ? Jtfus leucopus, RICH. Zool. Jour. III. 1828. IB. F. B. Arn. I, 1829 142. 



SP. CH. Young, light ashy gray ; adult, with a tinge of yellow h brown ; neither is there any dorsal stripe. Tail 

 scarcely longer than the body, exclusive of the head. Posterior tubercle of sole small, rounded, far forward. Soles hairy 

 for half their length. Tail white, except a narrow line above of dusky. Ears large, with long hairs ; one-half of the ear 

 hoary, in strong contrast with the dusky of the remaining portion. 



Specimen obtained at St. Mary s Mission, Rocky mountains. 



NEOTOMA OCCIDENT ALIS, Cooper. 



Bushy-tailed Rat- 



BAIRD, Gen. Rep. Mammals, 1857, 496. 



SP. CH. Size of Norway rat. Fur harsh. Tail densely hairy; the vertebrae as long or longer than tho body, without the 

 head. Color above, brownish plumbeous, mixed with yellowish brown. Beneath, with feet, bluish white. 



New Dungeness, Straits of de Fuca. (149.) 



