101 



lower are very thin and slender, and nearly white. The first, or 

 deciduous, grinder, as in all the smaller epecies of Pine Squirrels 

 that I have examined, is wanting ; the remaining grinders, both in 

 the upper and lower jaw, do not differ very materially from those 

 of Douglas' Squirrel. 



" Dental formula : incis. |, can. °=^, mol. *^, = 20. 



" The body of this most diminutive of all the known species of 

 genuine squirrel in North America, is short, and does not present 

 that appearance of lightness and agility which distinguishes the 

 S. Hudsonius. Head large, less elongated, forehead more arched, 

 and nose a little blunter than Sc. Hudsonius ; ears short ; feet of 

 moderate size. The third toe on the fore-feet but slightly longer 

 than the second ; the claws are compressed, hooked and acute ; 

 tail shorter than the body ; the thumb-nail is broad, flat and blunt. 



" The fur on the back is dark plumbeous from the roots, tipped 

 with rusty brown and black, giving it a rusty gray appearance. 

 It is less rufous than the Sc. Hudsonius, and lighter coloured 

 than the Sc. Douglasii. The feet on their upper surface are 

 rufous : on the shoulders, forehead, ears, and along the thighs, 

 there is a slight tinge of the same colour. The whiskers, which are 

 a little longer than the head, are black. The whole of the under 

 surface, as well as a line around the eyes, and a small patch above 

 the nostrils, smoke-gray. The tail for about one half its length 

 presents on the upper surface a dark rufous appearance, many of the 

 hairs being nearly black, pointed with light rufous : at the extremity 

 of the tail, for about an inch and three-fourths in length, the hairs 

 are black, a few of them slightly tipped with rufous. The hind- feet, 

 from the heel to the palms, are thickly clothed with short adpressed 

 light-coloured hairs ; the palms are naked. The sides of the body 

 are marked by a line of black commencing at the shoulder and ter- 

 minating abruptly on the flanks : this line is about two inches in 

 length and four lines wide. 



Dimensions. in. lines. 



Length of head and body 6 2 



Tail (vertebrae) 3 6 



Do. including fur 5 



Ears posteriorly 3 



Do. including fur 5 



Palm and middle fore-claw 13 



Sole and middle hind- claw 19 



SciuRtrs XANUGiNosus. DoviTQy Squirrel. 



Sciurus corpore suprd. flavescenti-griseo, laterihus argenteo-cinereis , 

 abdomine alba : pilis mollibus et lanuginosis : auribus brevibus : 

 paltnis pilis sericeis crebri instructis ; caiidd corpore breviore. 



" A singular and beautiful quadruped, to which I have conceived 

 the above name appropriate, was sent to me with the collection of 

 Dr. Townsend. He states in his letter, ' Of this animal I have no 

 further knowledge than that it was killed on the North-west coast. 



