194 



MONOGRAPHS OF NOKTII AMERICAN KODENTIA. 



Table XLVIII. — Measurements of twenty-nine specimens of northern Akvicol^e of tin iuparius type, and not 



distinguishable from thatspi 



It appears from the foregoing that the average of this series is nearly 

 at the minimum of United States riparius, and that its maximum is at the 

 average of ordinary riparius. The average tail (1.32) is below the smallest 

 average of any of the United States series of riparius tabulated, while the 

 average foot (0.71) is about at the minimum of the latter; only three feet, 



