320 University of California Publications in Zoology  [Vou.17 
Fort Tejon, 3; Ventura County: Mount Pinos, 3; San Bernardino 
County: Providence Mountains, 2 (U. S. Biol. Surv.) ; San Bernar- 
dino Valley, 1 (Acad. Nat. Sci. Phila.) ; San Bernardino Mountains, 
31; Los Angeles County: near Pasadena, 14; west fork of San Gabriel 
River, 1; Orange County: Trabuco Canon, 1; Riverside County: 
Riverside, 1 (Stanford Univ.); San Jacinto, 32 (Stanford Univ.) ; 
San Jacinto Mountains, 10; San Diego County: Escondido, 2; Foster, 
1; Cuyamaca Mountains, 6; San Felipe Canon, 2; Julian, 5; Pine 
Valley, 4 (U. S. Nation. Mus.) ; Dulzura, 2 (U. S. Nation. Mus.) ; 
Imperial County: Colorado River near Pilot Knob, 1; Palo Verde, 1. 
Natural History. J. Grinnell (1908, p. 159) reports the brown 
bat to have been the most common and generally distributed bat in 
the San Bernardino Mountains in the summers of 1905, 1906, and 
1907. It came out early in the evening, often soon after sundown, 
and proved easy to secure by shooting. Specimens taken in August 
were excessively fat. 
At Guerneville, Sonoma County, where three specimens were 
secured in the summer of 1913, these bats were invariably seen flying 
slowly and steadily high over the canon bed, whereas the hoary bats 
flew low over the meadows, and the little California bats zigzagged 
in and out close about the tops of the young redwood growth. The 
large size and slow, steady flight of this bat render it comparatively 
easy to secure by shooting; hence the abundance of specimens in 
collections misrepresents its actual relative abundance among the 
various species of bats in the wild. 
Bailey (1905, p. 211), when recording the large brown bat from 
Texas, states that he found two lower jaws of this bat, among numer- 
ous other bones, in pellets under the nest of a great horned owl. 
Three females in the Museum of Vertebrate Zoology, each con- 
taining a single embryo, were secured on the following dates: April 
22, June 10, and June 25. Adult females secured by Dixon at Fyffe, 
Eldorado County, between July 19 and 31, were considered by him 
(MS) as having ceased to nurse their young. 
General Remarks——An examination of a series of 278 specimens 
of the large brown bat, taken in California, shows the probable exist- 
ence of two or even three races within the state. Specimens from the 
humid coast belt of northwestern California average very much 
darker than a series from the southeastern part of the state; yet 
individual variation is so great that until a much larger series of 
specimens becomes available for comparison it is impossible to define 
