214 PROCEEDINGS OF THE ACADEMY OF [1897. 



skulls of the three series show a parallel gradation in size southward 

 from canadensis to nubiterrce, but no diagnostic features of a higher 

 grade to distinguish the two extremes. It is of interest to note that 

 the decrease in size of body as the species nears the Carolinas is not 

 correlated by a shortening of the tail and hind feet, but that these 

 members are relatively lougest in nubiterrce. 



Mr. Ingersoll makes the following notes on this subspecies: 



"Peromyscus canadensis I took only at Krings in Cambria Co. and 

 at Summit Mills in Somerset Co. 



"At Kring's they seemed to prefer the most retired and secluded 

 places, especially the narrow and deep wooded valleys with little 

 streams flowing through. The first I caught were in such a place, 

 the timber being mostly oak and beech and maple, with here and 

 there a hemlock. Many old and decaying logs and stumps offered 

 them pleasant homes, and nowhere else in that locality did I find 

 them so abundant, and never did I find any at any great distance 

 from the water, nor more than halfway up the low mountain. Pero- 

 myscus leucopus and Blarina brevicauda were also taken in the same 

 places. 



"At Summit Mills, a region altogether higher, canadensis seemed 

 to have replaced leucopus entirely, and there I took them everywhere, 

 in stone walls along the edges of fields grown up to briars and 

 bushes, in oak woods and in hemlock woods, and one in a trap set 

 among the rocks on the top of a mountain for Rock Rats [JV. mag- 

 ister~\. I caught a rat in the same place. Traps set for Evotomys in 

 low, damp ground also often caught P. canadensis.'" 



20. Neotoma magister Baird. Allegheny Cave Rat. 



So far as I have been able to discover, this rat has been taken in 

 the following localities in middle Pennsylvania: 



Clinton County : — " Plentiful in our rocky mountains " — Nelson. 

 " In mountains near Renovo " — Pierce. 



Cambria, Somerset and Bedford Counties: — "Found locally in 

 the tops of the mountains " — Ingersoll. 



Adams and Franklin Counties : — " In rocky gorges in South 

 Mountain, near Graffensburg " — M. W. Strealy. 



Cumberland County : — Living among Lewis's Rocks (type local- 

 ity of N. pennsylvanica Stone) — J. G. Dillin, S. N. Rhoads. Lime- 

 stone caves near Carlisle and opposite Harrisburg (type locality of 

 fossil N. magister Baird) — S. F. Baird. 



Specimens (both recent and fossil) in the collections of the 

 Academy of Natural Sciences of Philadelphia and of the writer, rep- 



