96 Field Museum of Natural History — Zoology, Vol. XT. 



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 (Genns Epitnys); 6, Porcu- 

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



