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194 



MONOOltAPHS OF NORTH AMERICAN RODENTIA. 



Taiii.i; XLVIII. — ileaaurementt of tirealg-iiine «> 



diHtiiiyuighuL 



vorlhcrM Akvicolx of the iui'arivs type, md not 

 that tpecia. 



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

 at the minimum of United States ripuriuit, 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 tiie 

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



