96 FIELD MUSEUM OF NATURAL HISTORY ZOOLOGY, VOL. XI. 



Skulls of Rodents (Order Glires). 



i. Gray Squirrel (Genus Sciurus); 2, Varying Hare (Genus Lepus}; 3, Jumping Mouse (Genus 

 Zapus}\ 4, Pocket Gopher (Genus Geomys); 5, Brown Rat or House Rat (Genus Epimys); 6, Porcu- 

 pine (Genus Erethizon). (About K nat. size.) 



