268 University of California Publicatious in Zoology [Vol.12 



received his specimen from C. H. ^Merriam, whose residence at that 

 time was Locust Grove, New York. 



The case seems to be clear, and I propose that the Pacific slope race 

 be called Pipistrellus hesperus merriami (Dobson), the tj'pe locality 

 of which is thus Red Bluff, California. The characters of this form, 

 as compared with P. li. Jicspirus. lie in the darker, distinctly browner 

 tone of coloration both above and below, and in somewhat larger size 

 throughout. The ]Museum has specimens, unequivocally of this form, 

 from the following localities, all within the state of California : Marys- 

 ville Buttes, Sutter County ; Raymond, iladera County ; Cuyama Val- 

 ley, Santa Barbara County; Fort Tejon, Kern County: San Fran- 

 eisquito Caiion, northern Los Angeles County ; vicinity of Pasadena : 

 Escondido, San Diego County. 



Eptesicus fuscus ^ Beau vols) 

 Large Bro^\Ti Bat 



One shot at dusk on the California side near Pilot Knob, May 6. 

 Other bats supposed to be the same species were seen flying down 

 the river high overhead the same evening. A strong west wind was 

 blowing at the time. The species was not seen at any other place. 



The specimen secured (no. 10697) is an adult female. It appears 

 to differ in small size and extreme paleness from the average of the 

 species from California. It about equals in the latter respect the 

 palest out of a series of ninety brown bats from the Pacific slope of 

 California. The color dorsally is uniform isabella color, ventrally pale 

 wood brown. Measurements : length 107 mm., tail vertebrae -i-i, foot 9, 

 forearm 4:2.5, longest finger 72, ear (dry) 12. The sk\ill, too. is appre- 

 ciably small. 



A general inspection of the iluseum's series of this species from 

 California points towards the existence within the state of at least 

 three geographic races based on size and depth of color. But so much 

 of the total area is unrepresented by specimens that systematic analysis 

 at this time seems inadvisable. 



Nyctinomus mexicanus Saussure 



Mexican Free-tailed Bat 



We were fairly certain of seeing this bat at almost every station, 



as a rule flying high and often squeaking loudly. Only three specimens 



were secured (nos. 10690-10692) the first two at Mellen. February 26. 



the third in Chemehuevis Valley, ilarch 11. 



