628 PROCEEDINGS OF THE NATIONAL MUSEUM. vol.59. 



Type locality. — Coconino Forest plateau, Arizona. 



Type formation. — Early Pleistocene. 



Diagnosis. — Size about that of Citellus franklini. Rows of upper 

 teeth converging backward. Palate narrow. 



The skull which is made the type of this species presents that 

 part which lies in front of the brain case. This part is damaged 

 and slightly distorted. The small foremost premolars (pm 3 ) are 

 missing. The other teeth are in fine condition. A part of one nasal 

 bone is present, but displaced. Most of the left premaxilla is miss- 

 ing. Much of the bone is covered with a coating of calcite. 



In size this animal resembled C. franklini. Its conspicuous char- 

 acter is the convergence of the rows of upper teeth backward. The 

 following comparative measurements are presented: 



Measurements of skulls of Citellus. 



Length of upper row of teeth 



Length of last premolar and three molars 



Space between last two premolars 



Space between hindermost molars 



Length of suture between maxillae on palate. 



C. frank- 

 lini. 



7 

 13.5 



C. t nit us. 



10.8 

 9.6 

 7 

 5.6 



13.5 



It will be observed that, while the rows of teeth are slightly longer 

 in C.tuitus than in C. franklini, the palate is narrower at each end, 

 and that the rows approach each other more rapidly in the fossil. 



While the bones and teeth are colored green by the copper, there 

 are yet traces, on the enamel of the incisors, of the original orange 

 color. 



Family CRICETIDAE. 



NEOTOMA CINEREA Ord. 



In the collection made by Mr. Brown for the American Museum of 

 Natural History, in New York, there is a right ramus which is not 

 distinguishable from that of Neotoma cinerea. It contains all of the 

 grinding teeth except the hindermost. The catalogue number is 

 14365 of the American Museum. 



LEPUS BENJAMINI, new species. 



Plate 121, figs. 1-56. 



Type specimens. — A part of a left ramus, containing the premolars 

 and molars, except the hindermost (Cat. No. 10183). 



Type locality. — Coconino plateau, Arizona. 



Type formation. — Early Pleistocene. 



Diagnosis. — Differing, so far as known, from Lepus campestris only 

 in having the enamel of the outer infold of the lower molariform 

 teeth distinctly crenulated behind, 



