1918] Grinnell: A Synopsis of the Bats of California 821 
limits of range satisfactorily. For example, five specimens of EH ptesi- 
cus fuscus in the Museum of Vertebrate Zoology, selected because 
of their close resemblance in color (bright buffy brown above, pale 
avellaneous beneath) were found to have come from the following 
widely separated localities: No. 2778, Julian, San Diego County; 
no. 6959, San Bernardino Mountains, San Bernardino County; no. 
5145, near Pasadena, Los Angeles County; no. 5141, Mt. Pinos, 
Ventura County; no. 3286, Mt. Shasta, Siskiyou County. 
In the original description of EF. f. bernardinus (from a single 
specimen taken in the ‘‘San Bernardino Valley’’), Rhoads (1901, 
p- 619) remarks that ‘‘a series of four specimens from the same 
collector taken in the ‘San Bernardino Mts.’ in September, 1893, 
shows that the mountain form is inseparable from fuscus; one of 
these, however, is a perfect intergrade.”’ I have examined Rhoads’ 
type (no. 8247, ¢, Acad. Nat. Sci. Phila.) and find it well within 
the range of individual variation of specimens from the San Bernar- 
dino Mountains, and darker than the two specimens at hand from the 
Colorado River. 
J. Grinnell (1908, p. 159) comments as follows upon a series of 
skins of the large brown bat taken in the San Bernardino Mountains: 
The series of thirty skins secured shows much variation in depth of color. 
Some are very light-colored, and these agree with Rhoads’ subspecies bernardinus. 
But others are as dark as the darkest I have seen from elsewhere in central and 
southern California, so that I cannot perceive the existence of a race bernardinus 
if it is to be based on color characters alone; unless it be that all California 
examples differ from the eastern animal. 
Grinnell and Swarth (1913, p. 382) remark concerning a series 
of nine large brown bats taken in the San Jacinto Mountains: ‘‘The 
specimens taken show much variation in color, and the remarks made 
in regard to a series from the San Bernardino Mountains apply here.’’ 
J. Grinnell (1914, p. 268) says of a single example of Eptesicus 
fuscus taken by the Colorado River expedition on the California side 
of the river near Pilot Knob: 
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 
44, foot 9, forearm 42.5, longest finger 72, ear (dry) 12. The skull, too, is 
appreciably small. 
A general inspection of the Museum’s series of this species from California 
points towards the existence within the state of at least three geographic races 
