270 GNAWING ANIMALS 



On Prairie-" Dogs." — The Prairie-Dog of the Great Plains. By Dr. C. 



Hart Merriam; pamphlet, 14 pages. Yearbook of the Department 



of Agriculture, 1901. 

 On Ground Squirrels. — The Prairie Ground Squirrels of the Mississippi 



Valley. By Vernon Bailey; pamphlet, 69 pages. Bulletin No. 4, 



Biological Survey, Department of Agriculture, 1893. 



