APPENDIX. 329 



reason to believe that it is very contracted, never having met 

 with it many miles from this locality. It is here abundant, but 

 very shy and retired, keeping constantly in the densest worm- 

 wood bushes, and leaping, with singular speed, from one to 

 another, when pursued. I have never seen it dart away, and 

 run to a great distance like other hares. I found it very difficult 

 to shoot this animal for the reasons stated. I had been residing 

 at Fort Walla-walla for several weeks, and had procured only 

 two, when, at the suggestion of Mr. Pambrun, I collected a party 

 of a dozen Indians armed with bows and arrows, and sallied 

 forth. We hunted through the wormwood, within about a mile 

 of the fort, and in a few hours I'eturned, bringing eleven hares. 

 The keen eyes of the Indians discovered the little creatures 

 squatting under the bushes, when, to a white man, they would 

 have been totally invisible. This hare when wounded and taken, 

 screams like our common species. — Towns, in lit. to Dr. 

 Bachman. 



Oregon Flying Squirrel. 



Pteromys *Oregunensis, (Bachman,) Journal Acad. Nat. 

 Sciences, Vol. 8 part, I. 



"Characters. — Intermediate in size, between P.volucella, and 

 the northern P. sabrinvs ; ears longer than the latter species ; 

 fur more compact; the lobe of the flying membrane joining the fore 

 foot, much longer in proportion, making that membrane broader ; 

 foot larger ; general color above brown ; beneath yellowish- 

 white. 



Description. — All the fur of this species is deep gray at the 

 base; that of the back tipped with yellowish-brown; tail, pale 

 brown above, dusky towards the extremity ; beneath, brownish- 

 white. Whiskers numerous, and very long, chiefly of a black 

 color, and grayish at the tips. Hairs covering the flying mem- 

 brane chiefly black, most of them slightly tipped with pale 

 brown ; feet dusky ; around the eyes blackish ; ears with mi- 

 nute, adpressed brown hairs externally, and brownish-white 

 internally. 



This species differs much from P. sabrinns in several very 



striking particulars. Although a smaller animal, the bone of the 



wrist, which supports the flying membrane, is eleven and a half 



42 



