Sitb»penfic r//itr(irltr.s. — Si/e and cranial characttTS exactly like those 

 of Pcrofinathiix fdllax falht.v. Pela.:^e li.ii'ht yray {No. 9 of Ridji-way's 

 color manvial) at base instead of dark liray (No. 0, Ridiiway), and the 

 general effect pale broccoli-brown instead of bistre above, where it is 

 much more lightly mixed with black than in f(iUa.v; tail-stripe drab in- 

 stead of hair-brown; lateral line and subterminal zone of hairs of up- 

 perparts pale pinkish buff; feet and underparts creamy white: ears 

 with a few white hairs anteriorly. Younir, pale smoke-gray above. 



Measurements. — Average of six adult females from the east slope and 

 notch at summit of Coast Range Mountains, near the Mexican boundary 

 (Mountain Spring to .Tacumba): length, 195 mm. (188-206); caudal ver- 

 tebrie, 107 (98-112); hind foot, 24.2 (28. 7-25): ear from crown. 0.9 (6.5-7). 



Distribution. — Specimens have been examined from San Jacinto Lake, 

 Riverside County, California: San Felipe Canyon. Mountain Spring, 

 wagon-pass at svimmit of Coast Range, and Jacumba Hot S{)rings. in 

 San Diego County, California and Lower California. 



Acknowledgments. — I am indebted to the" authorities of the United 

 States National Museum and the Biological Survey of the Department 

 of Agriculture for the use of the required materials, and to Mr. \Vilfred 

 H. Osgood for assistance in studying the gi'oup. 



