Vol. XIV. pp. 135-136 August 9, 1901 



PROCEEDINGS 



OF THE 



BIOLOGICAL SOCIETY OF WASHINGTON 



A NEW P0CKETM0U8E FROM SOUTHERN 

 CALIFORNIA. 



IJY EDGAR A. MEARNS. 



The fonn of Peroynathits falla.r inhabiting the eastern or 

 desert slopes of the mountains of Riverside and San Diego 

 counties, California, and thence southward along the eastern 

 slope of the Coast Range into Lower California, is almost as 

 pallid as the j»ocketmouse of the Colorado Desert which Mr. 

 Osgood named Perognathns penicillahts (iiigKstirostrls. The 

 niixae fdllav, in a subspecific sense is here restricted to the ani- 

 mal of the coastal region, although the type and series of topo- 

 types, from Reche Canyon, three miles southeast of Colton, San 

 Bernardino County, California, are almost exactly intermediate 

 between it and the desert race. The darkest individuals ex- 

 amined are from Rose Canyon and San Pasqual Valley, on the 

 western border of San Diego County. 



Perognathus fallax pallidus subsp. nov. 



PALIJJ) POOKRTMOUSE. 



Type. — No. t)l,UU7, United States National Museum. Skin and skull 

 of adult female, from Mountain Spring', half-way up the east slope of the 

 Coast Range Mountains, on the Mexican Boundary Line, in San Die.iio 

 County, California. Collected May 10, 18S)4. by Edgar A. Mearns. 

 Original No. a520. 



26— Biol. .Soc. Wash. Vol. XIV, 1901. (135) 



