1913] 



Merriam: Notes on the Canid Genus Tephrocyon 



367 



9 mm. in anteroposterior diameter in M 2 . In T. kelloggi the 

 anteroposterior diameter of Mj is 15 mm. ; of M 2 , 10.5 mm. There 

 is a small hypoconulid on the heel of M t in the Mohave speci- 

 men, while in the type of T. kelloggi this tubercle is not sug- 

 gested. The heel of M 2 seems somewhat shorter than in T. kel- 

 loggi. 



8b 



Figs. 8a and 8b. Tephrocyon temerarius (Leidy). A portion of the 

 mandible with dentition. No. 19402, natural size. Mohave Beds, Mohave 

 Desert, California. Tig. 8a, superior view; fig. 86, lateral view. 



P 4 and P 3 both possess a posterior cusp and a posterior basal 

 tubercle. P 4 shows a small anterior basal tubercle. The anterior 

 side of P 3 is not preserved. 



Several specimens of mandibles slightly larger than no. 19-402 

 represent a Tephrocyon species from the Mohave Beds very near 

 T. temerarius. It is possible that they belong to another species, 

 but age and sex are presumably competent to account for the 

 differences. 



Tephrocyon kelloggi Merriam, J. C. 



Tephrocyon kelloggi Merriam. Univ. Calif. Pub!., Bull. Dept. Geol., 

 vol. 6, p. 235, 1911. 



To this species there have been referred several jaws and 

 detached teeth from the middle Miocene Virgin Valley Beds 

 of northern Nevada. A single tooth from the early Pliocene of 



