Monograph of the Genus Sciurus. 297 



feet black ; rndimental thumb covered by a broad flat nail. The 

 hair in summer j\ 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 aureogaster. (F. Cuv. and Geoff".) Californian 

 Sq,uirrel. 



" Sciurus aureogaster ; F. Cuv. and Geoff. Mamm. 



" Ecureuil de la Calafornie; Id. 



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

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

 limbs 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. 



BIMENSIONS. 



" Length from nose to root of tail, - - - - 



Ditto of tail to end of hair, 



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



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



Height of ear posteriorly, _ - . _ . 



6. Species cinereus. Lin. Cat Squirrel. 



Essential characters. — A little smaller than the Fox Squir- 

 rel ; larger than the northern Grey Squirrel ; body stout ; legs 

 leather short ; nose and ears not lohite ; 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. XXXVII, No. 2.— July-October, 1839. 38 



