1918] Grinnell: A Synopsis of the Bats of California 367 
1; Ventura County: Santa Paula, 1 (Stanford Univ.) ; Ventura, 8; 
Kern County: Fort Tejon, 1; San Luis Obispo County: Painted Rock, 
Carrizo Plains, 2; Fresno County: Fresno, 29; Lane Bridge, 10 miles 
“north Fresno, 2; Mariposa County: El Portal, 1; Coulterville, 2; 
Mono County: Walker Lake, 1; Merced County: Los Banos, 18; 
Stanislaus County: Grayson, 1; Santa Clara County: Menlo Park, 7; 
Palo Alto, 13 (Stanford Univ., 5; Mus. Vert. Zool., 8); Stanford 
University, 1 (Calif. Acad.); San Jose, 52 (Stanford Univ.); San 
Mateo County: Belmont, 5 (Acad. Nat. Sei. Phila.) ; Alameda County : 
Berkeley, 2 (U. C. Dept. Zool.) ; Alameda, 1; San Joaquin County: 
Tracy Lake, 6 miles southwest Galt, 1; Contra Costa County: Con- 
cord, 24; Eldorado County: Limekiln, 12; Placer County: Auburn, 
1; Sutter County: Marysville Buttes, 3 miles southwest Sutter, 1. 
Natural History—This bat is gregarious and apparently prefers 
retreats in buildings rather than those afforded by nature. I know 
of no instance of the finding of these bats in natural haunts save 
where they had no choice of other quarters. On May 27, 1911, 
Swarth (MS) found a cluster of these bats in company with a large 
number of Antrozous pacificus in a erevice extending upward from 
a hollow at the base of Painted Rock, Carrizo Plains, San Luis Obispo 
County. When a buggy whip was thrust up among them some of 
the bats crawled farther up into the crevice, while about fifteen or 
twenty tumbled out and flew about the rock seeking other shelter. 
At Glendora, Los Angeles County, a raid upon a colony of Antrozous 
occupying the spaces under the eaves of a barn loft resulted in the 
capture of ten Antrozous and a single male Nyctinomus mexicanus. 
More of the latter species may have been present as many of the bats 
disturbed eluded capture and escaped into the open air. Stowell 
(1894, pp. 362-364) records the finding of large numbers of these 
bats behind the iron window shutters of the courthouse in San Jose. 
On February 27, the leaves of one of these shutters were opened and 
the bats were found thickly clustered in the darker recesses. The 
bats made little effort to escape and about seventy specimens were 
secured. These consisted of males and females in about equal num- 
bers. The window from which these bats were secured was on the 
west side of the building. On March 3, of the same year, thirty-two 
specimens were taken from another west window and these bats also 
consisted of an equal proportion of the two sexes. An examination 
of four different windows on the east side of the building resulted in 
the capture of thirty-five specimens, all females. W. P. Taylor 
