Black Rat Rattui rattus rattus 



the dorsal surface it is a rather lead-colored black. The 

 ventral surface is a slate-colored black. In addition to 

 the difference in color, the tail of the black rat is 

 much longer in proportion than that of the brown rat 

 and the scaly rings on the tail are even more prominent 

 in the black rat than in the brown rat. 



The habits of the black rat are similar to those of 

 the brown rat except that it does not burrow under 

 foundations. 



Another rat that may be found in Pennsylvania in 

 scattered localities and in reduced numbers, is the roof 

 rat or Alexandria rat (Epimys rattus alexandrinus 

 Geoffroy). It is smaller than the brown rat and proxi- 

 mates the size of the black rat. Its tail is more than 

 half the body length while the color is reddish brown 

 above, blending into a grayish white below. It is ap- 

 parently scarce. 



Wood or Cave Rat 



Ncotoma Pennsylvanica 



The Pennsylvania woodrat is most common in 

 the mountainous counties of the State where it lives in 



-*t 143 >*- 



