1897.] NATURAL SCIENCES OF PHILADELPHIA. 27 



suited to determine this point. In any event, all the Pine Voles of 

 Pennsylvania and New Jersey belong more properly to the northern 

 type. 



No specimens were taken except at Delaware Gap. 



9. Evotomys gapperi (Vigors). Gapper's Wood Vole. 



Thirteen specimens were trapped in and about Bear Swamp near 

 Long Lake, and six more in a hemlock swamp in the bottoms of the 

 Walkill about two miles south of the New York State line. They 

 are similar to specimens from Quebec, being lighter colored than 

 those taken by Mr. Stone at May's Landing, New Jersey, in 1893. 



I am convinced that the reason this species was not taken near 

 Greenwood Lake, was my neglect to set traps in the more retired 

 and deep-shaded hemlock swamps. 



10. Fiber zibethious (L.). Muskrat. 



No specimens of this abundant species were taken, except at Lake 

 Hopatcong. 



11. Peromyscus leucopus (Raf.). Deer Mouse. 



A large series of deer mice from every locality mentioned in the 

 itinerary of this paper closely conform in character to those of other 

 parts of New Jersey and Pennsylvania. Though abundant in 

 localities where Evotomys was found, no specimens of P. canadensis 

 were secured among them, showing that the mountains of northern 

 New Jersey lack the more typical Canadian elements which are 

 found in isolated places in Pennsylvania where I have taken cana- 

 densis. 



There is a marked racial difference between leucopus of Pennsyl- 

 vania and New Jersey and the type of leucopus found in Massachu- 

 setts and northern New York, the latter being smaller and brighter 

 colored with a narrower dark dorsal stripe and more hairy tail. 

 Pennsylvania and New Jersey specimens are practically identical 

 with those collected by me in west Tennessee and Kentucky, where 

 the type form of leucopus defined by Rafinesque is found. It has 

 been proved by Mr. G. S. Miller, Jr., 5 that the Cricetus myodes of 

 Gapper applies to the smaller short-tailed deer mouse of Canada 

 which is apparently identical with those of northern New York and 

 New England. These facts induce me to revive the name myodes 

 for the small deer mouse of the eastern Canadian fauna, making it 

 read Peromyscus leucopus myodes (Gapper). 



5 Proc. Biol. Soc. Wash., 1893, pp. 59, 60. 



