UNIVERSITY OF CALIFORNIA PUBLICATIONS 



ZOOLOGY 



Vol. 12, No. 6, pp. 297-300 April 15, 1914 



A PREVIOUSLY UNDESCRIBED APLODONTIA 



FROM THE MIDDLE NORTH COAST 



OF CALIFORNIA 



BY 



WALTER P. TAYLOR 

 (Contribution from the Museum of Vertebrate Zoology of the University of California) 



The recent discovery by field parties working in the interests of 

 the California Museum of Vertebrate Zoology, of two new forms of 

 Aplodontia, is a testimony both to the restricted habitats of the animals 

 in this genus and to the incompleteness of our knowledge of even 

 so small and well-worked an area as the State of California. Addi- 

 tional attention is directed to these points by the fact that one of the 

 new forms is the most strikingly marked species yet found within the 

 state. 



Material in the collection of the Museum indicates the existence 

 in the vicinity of Humboldt Bay, California, of a third distinct new 

 form, most closely related to Aplodontia chryseola Kellogg, of the 

 Trinity Mountains. The status of this form cannot certainly be de- 

 termined, however, without more specimens. 



Aplodontia nigra, new species 

 Point Arena Mountain Beaver 



Type: Male adult, no. 20320, Mus. Vert, Zool. ; Point Arena, 

 Mendocino County, California; July 10, 1913; collected by C. L. 

 Camp ; original number 1003. 



Diagnostic Characters: Most closely related to Aplodontia phaea 

 Merriam, but nasal outline swelling at the sides anteriorly, the broad- 

 est portion of the nasals tending to be just posterior to their anterior 



