UNIVERSITY OF CALIFORNIA PUBLICATIONS 



IN 



ZOOLOGY 



Vol. 10, No. 6, pp. 155-166, 1 text-figure May 21, 1912 



A NEW PEROGNATHUS FROM THE SAN 

 JOAQUIN VALLEY, CALIFORNIA 



BY 



WALTER P. TAYLOR 



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



During the months of March, April, and May. 1911, a party 

 from the Museum of Vertebrate Zoology carried on biological 

 exploration in the northern, central and southern parts of the 

 San Joaquin Valley and also in the Carrizo Plain of San Luis 

 Obispo County. The existence in the San Joaquin Valley of two 

 races of Perognathus longimembris is one of the first results 

 apparent. 



Perognathus longimembris neglectus, new subspecies 

 McKittrick Pocket Mouse 



Type: Male adult, no. 14526, Mus. Vert, Zool.; McKittrick, 

 Kern County. California, altitude 1111 feet; May 18, 1911; col- 

 lected by H. S. Swarth and W. L. Chandler; orig. no. 8986. 



Diagnostic Characters; Larger in all dimensions than its 

 nearest relative. Perognathus longimembris longimembris (see 

 tables of measurements, pp. 164. 165), being in total length 12.25 

 per cent larger ; tail vertebrae 8.43 per cent ; occipito-nasal length 

 7.84 per cent; mastoid breadth 7.18 per cent; interorbital con- 

 striction 14.37 per cent. Paler than Perognathus 1. longimem- 

 bris. The tone of coloration is approximately the same in the 

 two subspecies, the evident dissimilarity between them being 

 due to a difference in extent of black tipping on the hairs. 



