220 MONOGRAPH OF THE GENUS SCIURUS. 



scanty support, with no prospect of producing for the public 

 advantage any part of that mass of information on practical 

 applications of Geology, which the experience of fifty years 

 has accumulated,— information which, it may be safely as- 

 serted, no other man can give to the world. 



Art. III. — Monograph of the Genus Sciurus, with Descriptions of 

 New Species and their Varieties. By J. Bachman, D.D., Presi- 

 dent ol the Literary and Philosophical Society, Charlestown, South 

 Carolina, &c. 



( Continued from Page 162). 



7. Northern Grey and Black Squirrel. Sciurus leucotis. 



Grey Squirrel; Pennant's Arctic Zool., vol. i., p. 135; Hist. 



Quad. No. 272. 

 Sci. Carolinensis ; Godman, non Gmel. 

 Sciurus leucotis ; Gapper, Zool. Journ. vol. v. p. 206, published 



about 1830. 



Essent. Char. — Larger than the Carolina Grey Squirrel ; tail much 

 longer than the body ; smaller than the Cat Squirrel ; subject to many va- 

 rieties in colour. 



This sprightly and very common species, existing in the 

 northern and middle states, has hitherto been united with the 

 Carolina grey squirrel ; the name having been first appropri- 

 ated to the latter, and the present species being, as I shall en- 

 deavour, in this and the succeeding article, to prove, specifi- 

 cally distinct, I have proposed for it the above name. 



This squirrel seems to have permanently twenty-two teeth; 

 among a large number procured in different seasons of the 

 year, and some of them, from the manner in which their teeth 

 were worn, appearing to be old animals, all presented the 

 small front molars in the upper jaw, except a single specimen, 

 and even in this instance, these teeth may have accidentally 

 dropped out. This permanency in teeth that have been usu- 

 ally regarded as deciduous, would seem to require an enlarge- 

 ment of the characters given to this genus ; it will moreover 

 be seen that the majority of our species are similar to this in 

 their dental arrangements. 



The incisors are strong and compressed, a little smaller 

 than those of the cat squirrel, convex, and of a deep orange 

 colour anteriorly ; the upper ones have a sharp cutting edge, 

 and are chisel-shaped ; the lower are much longer and thin- 

 ner. The anterior grinder, although round and small, is as 

 long as the second ; the remaining four grinders are consider- 



