100 



Diniensions. in. liiies. 



Helght of ear posteriorly O 6 



Palm to end of middle fore-cla\v 1 4 



Heel and middle hind-claw 1 10 



Sciurus Hudsonius, (Pennant). The Chickaree Hudson's Bay 

 Sąuirrel. Red Sąuirrel. 



Common Squirrel. Foster, Phil. Trans., vol. 62, p. 378, an. 

 1772. 



Sciurus vulgaris, var. E. Erxleben Syst., an. 1777. 



Hudson's Bay Sąuirrel. Penn. Arct. Zool., vol. 1. p. 116. 



Common Sąuirrel. Hearne's Journey, p. 385. 



Red Barking Sąuirrel. Schoolcraft's Journal, p. 273. 



Red Sąuirrel. Warden*s United States, vol. i. p. 330. 



Ecureuil de la Baie d'Hudson. F. Cuvier, Hist. Nat. de Mam. 



Sc. Hudsonicus. Harlan. Godman. 



The Hudson's Bay Sąuirrel, a well-known species, is a third 

 smaller than the Northera Gray Sąuirrel ; tail shorter than the 

 body; ears slightly tufted. Colour, reddish above, white beneath. 



Dental formula : incis. ^^ can. ,^, mol. 4^1.= 20. 



Sciurus Richardsoni. Columbia Pine Sąuirrel. 



Small BroMTi Sąuirrel. Lewis and Clarke, vol. iii. p. 37. 



Sciurus Hudsonius, var. /3. Columbia Pine Sąuirrel. Richardson, 

 Fauna Boreali-Americana, p. 190. 



Smaller than Sc. Hudsonius ; tail shorter than the body ; rūsty 

 gray above, whitish beneath ; extremity of the tail black. 



This small species was first noticed by Le\vis and Clarke, ■vvho 

 deposited a specimen in the Philadelphia Museum, where it still 

 exists. I have compared it with the specimen brouglit by Dr. 

 Townsend, and find them identical. Dr. Richardson, \vho appears 

 not to have seen it, supposes it to be a mere variety of the Sciurus 

 Hudsonius. On the contrary, Dr. Townsend says in his Notės, 

 " It is evidently a distinct species ; its habits being very difFerent 

 frora those of the Sciurus Hudsonius. It freąuents the pine-trees 

 in the high range of the rocky mountains \vest of the great chain, 

 feeding upon the seeds contained in the cones. These seeds are 

 large and \vhite, and contain much nutriment. The Indians eat a 

 great ąuantity of them, and esteem them good. l'he note of this 

 sąuirrel is a loud jarring chatter, very different from the noise of 

 Sc. Hudsonius. It is not at all shy, freąuently coming down to 

 the foot of the tree to reconnoitre the passenger, and scolding at 

 him vociferously. It is, I think, a scarce species." 



The difFerence between these two species can be detected at a 

 glance by comparing the specimens. The present species, in addi- 

 tion to its being a fourth smeJler and about the size of the Tamias 

 Lysteri, has less of the reddish bro\vn on the upper surface, and 

 may always be distinguished from the other by the blackness of its 

 tail at the extremity, as also by the colour of the incisors, which 

 are nearly white, instead of the deep orange of the Hudsonius. 



The uj)per incisors are small and of a light ycllow colour ; the 



