MonograpJi of the Genus Sdurus. 297 



feci black ; mdimental thumb covered by a broad flat nail. The 

 hair in summer ^\ of an inch in length, which increases in win- 

 ter to one and one and three quarter inches. 



The bones of this species are distinguished by their remarkable 

 red color. 



5. Species aurcogastcr. (F. Cuv. and Geoff.) Califoknian 

 •Squirrel. 



<( 



(( 



Sciurus aurcogaster; F. Cuv. and Geoff. Mamm. 

 Ecurcuil de la Calafornic ; Id. 



"General hue above deep grey grizzled with yellow; under parts and 

 inner side of limhs deep rusty red; chin, throat and cheeks pale grey ; 

 Iiuibs externally and feet colored as the body above ; hairs on the toes 

 chiefly dirty white; tail large and very bushy ; hairs of the tail black, 

 twice annulated with dirty yellow, and broadly tipped with white, the 

 white very conspicuous where the hairs are In their natural position ; ears 

 thickly clothed, chiefly with blackish hairs, the hinder basal part exter- 

 nally with long white hairs, extending slightly on the neck ; all the hairs 

 of the body are grey at the base, those of the upper parts annulated first 

 with yellow, then black, and then white ; whiskers black, the hairs very 

 long and bristly ; the under incisors almost as deep an orange color as 

 the upper. - - ,. 



" Habitat Mexico and California. 



V-» 



DIMENSIONS 



In. lilies. 



" Lengtli from nose to root of tail, - - - - 12 

 Ditto of tail to end of hair, ----- 10 6 

 Ditto of heel to end of claws, - - - - . 2 



Ditto from nose to ear, - - - - . . 

 Height of ear posteriorly, - - - - i 



6- Species cinerciis. Lin, Cat Squirrel. 

 Essential characters. — A little smallrr than, fhr 



5^ 

 2 1^ 



2 7X" 



—A little smaller than the Fox Squir- 

 rel; larger than the northern Grey Squirrel; body stout ; lei^s 

 rather short; nose and ears not ivhite ; tail, longer than the body. 

 General description, — Head shorter and more obtuse than that 

 of the fox squirrel ; neck short, legs short and stouter ; tail also 

 shorter^ less distichous ; the body is also stronger and of a more 

 heavy, clumsy appearance. Incisors narrower than those of the 

 fox squirrel, also shorter and less prominent ; the nails shorter 

 narrower, and less arched. The color is subject to considerable 

 variations between light grey and black ; sometimes they are found 

 nearly white, without the red eyes of the albinos. The varieties 



Vol. xsxvH, No. 2.— July-October, 1839. " 38 



