170 EVOTOMYS. 



53. Evotomys. 



I. 5=i; M. ^0= i6. 



V. Bailev. Revision of the American Voles of the genus Evotomys. 

 Proc. Biol. Soc. Wash., iSgy, p. 113. 



Evotomys. Coues, Proc. Acad. Nat. Scien. Phil., 1874, p. 186. 

 Type. Mus nitt/us, Pallas. 

 Skull weak; zygomata slender and projecting but slightly out- 

 -ward; audital bullae large, inflated; interorbital region broad; mandi- 

 ble slender, weak; median process or shelf on palatal arch opposite 

 middle molar. Coronoid process of mandible with the apex below 

 the level of condyle. Molars two-rooted in old adults; front upper 

 molar with five exterior and interior triangles; middle upper molar 

 with four; back upper molar with seven, three exterior and four 

 interior. Fur long, soft; ears projecting beyond the fur; feet small; 

 a reddish or reddish brown dorsal stripe usually present. Lateral 

 .glands as in Arvicola, usually present in adult males. 



Fig. 37. Evotomys gapperi. 

 No. 80 Field Columbian Museum Coll. Enlarged li 



Lower tooth row. 

 Enlarged 6 times. 



Upper tooth row. 

 Enlarged 6 times. 



339. rutilus. {Mus), Pall., Glir., 1778, p. 246, pi. 14 B. 

 Type locality. Siberia, east of the Obi. 

 Geogr. Dislr. Arctic regions of America, Europe and Siberia. 



