MAMMALS OF PENNSYLVANIA AND NEW JERSEY. 7 



discovered. Of these, four, a small weasel, a native cave rat larger than the 

 Norway rat, a red-backed wood mouse or vole, and a lemming-vole, the 

 former two from Pennsylvania, the latter from New Jersey, have been de- 

 scribed as new to science. 



The specific synonymy used in the present paper is strictly confined to a 

 double literary reference ; first, to the earliest use of the name accompanied 

 by an original description of the species ; secondly, to the first use of the bi- 

 nomial or trinomial which I have considered applicable to it in the light of 

 present knowledge. The unpublished quotations from correspondents are suc- 

 ceeded by their last names only, and a list of these with their addresses given 

 in full at the end of the paper. Published quotations are accompanied by 

 references. No bibliographic list has been prepared owing to the very lim- 

 ited number of references of importance relating to our mammals except 

 those published in Philadelphia Journals of the Academy of Natural Sciences, 

 the American Philosophical Society, and in the American Naturalist. The 

 measurements given are in millimeters, their equivalents in inches being 

 given in brackets following. It may be explained that the " Type Locality " 

 is the place or region where the specimen orspecimens forming the original 

 description of the species, binomially named, was a native. 



The excellence of the illustrations is largely due to the skillful reproductive 

 photography of Mr. H. Parker Rolf e, of Philadelphia. 



Space fails me to here express more particularly the kind assistance rendered 

 by the many correspondents whose names are given in the appendix. They 

 have my grateful thanks. 

 Audubon, N. J., April ii, 1903. 



