390 PROCEEDINGS OF THE ACADEMY OF [1894. 



8. Castor fiber canadensis (Kuhl). American Beaver. 



The older residents concur in the opinion that the beaver was ex- 

 terminated nearly fifty years ago in northwestern Pennsylvania. 

 Their dams and meadows are still pointed out in numerous places 

 along the Bushkill and Diugman's creeks. 



9. Mus rattus L. Black Rat. 



This least offensive member of the Old World Murid?e remains 

 in undisputed possession of the barns and outhouses of the more 

 remote districts, but along the Delaware valley it has given place 

 to the following: — 



10. Mus decumanus Pallas. Norway Eat. 



As in other places where this pest has foothold, the supply far 

 exceeds the demand. 



11. Mus musculus L. House Mouse. 

 Well represented. 



12. Neotoma magister Baird. Alleghany Cave Rat. 



Remains of this animal, both fossilized and those apparently 

 quite recent, were taken, in 1880, from Hartman's Cave in Monroe 

 County, by Mr. T. D. Paret, of Stroudsburg. 



I have as yet been unable to determine whether this interesting- 

 animal is still living in that county or in Pike county. The 

 evidence from every source is negative, and this after the most dili- 

 gent inquiry. 



I personally explored several ledges, notably those of High Knob 

 and the cliffs along the Delaware south of Milford, without finding 

 a trace of their existence. It is not impossible, however, that the 

 recent habitat of this species may be traced, by isolated localities 

 along the Blue Ridge from South Mountain to the Hudson River 

 Highlands. Dr. C. H. Merriam, in a recent communication, states 

 that he believes the specimens of Neotoma, taken many years ago on 

 the Hudson near Rockland, New York, to be of this species. 



13. Peromyscus amerioanus (Kerr) Thomas.^ White-footed Mouse. 

 Numerous specimens of all ages, taken in three distinctly separated 



localities, strongly indicate a local variety of this susceptible species, 

 which apparently forms a connecting link between typical Pennsyl- 



* See Ann. & Mag. N. H., Nov. 1894, p. 364. 



