1913] Merriam: Notes on the Canid Genus Tephrocyon 361 



Tephrocyon, sp. (Matthew and Cook). Snake Creek. Ne- 

 braska. Early Pliocene. 



Tephrocyon?, sp. (Merriam). High Rock Canyon, Nevada. 

 Middle Miocene. 



T. vafer (Leidy) ? Snake Creek, Nebraska. Early Pliocene. 



So far as known, the several species may be characterized as 

 follows : 



T. rurestris. Mandible short and massive, relatively convex 

 below anterior end of the masseteric fossa. Inferior premolar 

 series short, inferior premolars without anterior cusps, meta- 

 conid of Mj moderately developed, M, relatively shorter antero- 

 posterior^- than in T. Jcelloggi, but longer than in T. hippophagus 

 and T. temerarius. 



T. hippophagus. Characters in general much as in T. rures- 

 tris. Inferior premolar series somewhat longer than in T. rures- 

 tris. Inferior premolars larger and thicker than in T. rurestris, 

 and with anterior cusps on P 2 , P.,, and P 4 . M 2 slightly shorter 

 and relatively thicker transversely than in T. rurestris. 



T. kelloggi. Mandible more slender than in T. rurestris and 

 T. hippophagus. Inferior premolar series relatively long. In- 

 ferior premolars small, relatively simple, and without anterior 

 cusps. Metaconid of M, relatively large. M 2 relatively long 



anteroposteriorly. 



T. temerarius. Mandible more slender than in T. rurestris 



and T. hippophagus. Mandible of Mohave Desert specimen 

 lighter than in T. kelloggi; other referred specimens not heavier 

 than T. kelloggi. P 4 with anterior cusp or tubercle, other pre- 

 molars imperfectly known. Metaconid of M, of medium size. 

 M 2 relatively much shorter than T. kelloggi, and slightly shorter 

 than in the other two species. 



