266 University of California Publications in Zoology [Vol.12 



I was fairly sure that I saw the same species at other localities along 

 down the river. Those obtained were all shot at late dusk, considerably 

 later in the evening than most of the appearances of Pipistrellus 

 hesperus. Instead of flying high, against the sky, as in the case of 

 the latter species, M. c. pallidus was almost always foraging low over 

 the bushes of the second bottom, or along shallow washes between 

 clumps of mesquite, seldom appearing above the sky-line. The move- 

 ments of flight were peculiar also. 



LIST AND MEASUREMENTS IN MILLIMETERS OF MYOTIS CALIFORNICUS 

 PALLIDUS TAKEN IN 1910 ON THE COLORADO RIVER 



The four specimens obtained are uniform among themselves and 

 with a topotype specimen of Myotis calif ornicus pallidus (no. 7350) 

 from Vallecito, on the western side of the Colorado desert in extreme 

 eastern San Diego County. All agree closely with the description 

 of .1/. c. pallidas (Stephens. 1900, p. 153). An additional feature, 

 as compared with Myotis californicus californicus from Monterey, 

 California, is the smaller skull of pallidus, with decidedly smaller 

 braincase, less inflated in the parietal region. 



Myotis velifer (J. A. Allen) 

 Cave Bat 

 Not obtained by our party ; but there are in the Museum three skins- 

 with-skulls (nos. 7762-7764) taken by Charles Camp at Needles July 

 16 and 18, 1909. Mr. Camp states that this species was roosting in 

 numbers in an old storehouse from which they were routed out and 

 shot. One of the specimens was forwarded to the Bureau of Biological 

 Survey, Washington, where the above determination was confirmed 

 by A. H. Howell. I do not find a previously recorded occurrence of 

 this species for California. 



