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 Erelhizon). (About K nat. size.) 



