324 APPENDIX. 



on their posterior surface, similar to tlie last species, and also to 

 another described by Say, as the Sciurus quadrimtatus, with 

 which I have compared it. The neck and whole of the under 

 surface, including the legs and thighs, are white. The tail, 

 which is quite narrow, is dark brown above, edged with light 

 rufous. Beneath, it is rufous near the roots, then a line of black 

 edged with light rufous ; from the end of the vertebra; to the 

 extremity, the hairs are black, a few of them are tipped with light 

 rufous." 



This species is found very plentiful along the banks of the Rio 

 Colorado, but I think does not inhabit a very extensive range, as 

 I never saw it after leaving this river. It keeps almost constantly 

 among heaps of stones, on the tops of which it often perches, 

 extending its long tail over its back, and curving it down in front 

 of its head. At such times it emits a lively, garrulous note like 

 the squeaking of a young puppy ; but if approached, darts off with 

 astonishing swiftness, carrying the tail level with the ground, and 

 almost eluding the eye by the activity of its motions, and con- 

 ceals itself under some jutting rock or in the interstices of a stone 

 heap until the intruder has passed. — Towns, in lit. 



Townsend's Geeat-eared Bat. 



Plecotus*Tow7isendii, (Cooper,) Annals of the Lyceum of 

 ' Nat. History of N. York, Vol. 4, p. 73. [Plate 3, fig. 6, the 

 head.] So-capual of the Chinook Indians. 



" Fur on the back dusky at base, brown at the tips, with a 

 ferruginous cast, the two tints appearing nearly uniform. The 

 ears are fringed with fur. Beneath, the fur is of a reddish 

 cinereous or ochreous hue, lighter towards the tail, but not in the 

 least whitish. The nose is similar to the P. Lccontii, but the 

 fleshy crests between the eyes and nostrils appear to be still 

 larger, and in the preserved specimens are much more con- 

 spicuous. The ears are similar, though every way more ample 

 in the present, and presenting a ditferent outline immediately 

 after rising from the forehead ; the auricle broader and larger. 

 The wing and tail membranes are entirely naked, dusky, of a 

 thicker texture, and much more strongly reticulated than in the 

 first species. 



