VOL. VIII, PP. 109-112 JULY 31, 1893 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON. 



TWO NEW WOOD RATS FROM THE PLATEAU REGION 

 OF ARIZONA (NEOTOMA PINETORUMANV N. ARIZONA) 



WITH REMARKS ON THE VALIDITY OF THE GENUS TEONOMA OF 



GRAY. 



BY C. HART MERRIAM, M. I). 



The two new mammals herein described are of unusual inter- 

 est, not only because they are very distinct from any heretofore 

 recognized, but also because they inhabit a region that has been 

 pretty thoroughly explored during the past few years, and 

 from which an unusually large number of mammals have been 

 already described,* 



One of the new species (N. arizonas) presents a remarkable 

 combination of the external characters of the bushy-tailed wood 

 rats (genus Teonomu of Gray) with the cranial characters of the 

 round-tailed species (Neotoma proper). The other (N. pinetorum'), 

 is a round-tailed species allied to the N. fuscipes group of Cali- 

 fornia. Incidentally, the study of N. arizonae led to the discovery 

 of an important character that serves to distinguish Teonoma 

 from Neotoma. 



* No less than twenty new species and subspecies were discovered in 

 my biological survey of the San Francisco Mountain region in Arizona 

 in 1889 (see N. Am. Fauna, No. 3. Sept., 189'J) ; and others have been de- 

 scribed from the same general region by Dr. Edgar A. Mearns and Dr. J. 

 A. Allen. 



16 Bror,. Soc. WASH., VOL. VIII, 1893. (109) 



