1918 ] Grinnell: A Synopsis of the Bats of California 373 
Los Angeles, 2 (U.S. Biol. Surv., 1; U. S. Nation. Mus., 1) ; Pasadena, 
6; Sierra Madre, 9; Kern County: Sumner, 1; Buttonwillow, 1 
(Calif. Acad. Sci.) ; Bakersfield, 1 (Univ. Calif. Dept. Zool.) ; Tulare 
County: Traver, 1 (Stanford Univ.) ; Fresno County: Fresno, 1. 
Natural History.—The type specimen of EL. californicus was found 
by E. C. Thurber on a December evening on a ledge over a door. 
Merriam (1890, p. 31) says: ‘‘Two others were caught during the 
same month (December, 1889), and both in similar situations. Mr. 
Thurber says of one of them: ‘It was hanging from the ledge of a 
window, swinging back and forth and knocking against the window 
as if to attract attention. All were caught about 8 or 9 o’clock in 
the evening.’ 
On October 1, 1916, Adrey Borell, of Fresno, sent to the Museum 
of Vertebrate Zoology a live mastiff bat which he had just found 
hanging on the inside of a window-sill in a school building in Fresno. 
H. C. Ohl (MS) found a mastiff bat in a railroad round-house at 
Mendota, Fresno County, in December, 1911. The last named locality 
constitutes the northwesternmost record station to date. 
Stephens (1906, p. 275) records the capture of a specimen behind 
a sign board and another in a tunnel, and adds that all dates known 
to him are in winter. 
On or about October 1, 1907, a specimen of EF. californicus (now 
no. 23391, Mus. Vert. Zool.) was found clinging to the side of a house 
at Mecea, Riverside County. 
On March 8, 1909, W. B. Donnell discovered five examples of 
E. californicus in Pasadena in the attie of an old house which was 
being torn down. These bats were very much emaciated, and the 
stomachs were found to be empty. These specimens are now nos. 
4326-4328, and 94388-9439 (Mus. Vert. Zool.). 
On December 27, 1912, at the writer’s suggestion, Mr. Charles 
L. Camp, of Sierra Madre, Los Angeles County, kindly investigated 
a rookery where he had found bats common in the summer time. This 
haunt was an old shedlike structure, some sixty feet long, and three 
stories high. The interior of the building was very dark and con- 
tained piles of old fruit-drying trays. In the summer time some bats 
had been found in between the trays, but more were discovered hang- 
ing to the shingles and rafters in the east gable of the building. The 
December visit revealed but a single living bat in the building, an £. 
californicus. This specimen was found hanging from the rafters. 
Near it hung a dead bat of the same species, evidently just killed and 
