1918 | Grinnell: A Synopsis of the Bats of California 281 
Pelage-——Fur everywhere full and soft, 5 to 7 millimeters in 
leneth on middle of back. Basal third of dorsal surface of ear 
furred; ventral (inner) side with fine, short hairs sparsely sprinkled 
over entire surface. Wings naked save for a narrow strip of fur 
along edge of body. Uropatagium furred on basal third, and on its 
ventral surface fine scattered hairs nearly to tip of tail. Upper 
surface of toes sparsely coated with short fine hairs. 
Color—A specimen (no. 12981, Mus. Vert. Zool.) taken in the 
Yosemite Valley, elevation 4000 feet, May 30, 1911, presents the fol- 
lowing coloration: General color of back mummy brown. Hairs on 
middle of back chaetura black on proximal 4 millimeters, then wood 
brown for about 1 millimeter, and with a 2 millimeter tip of mummy 
brown. On dorsal surface of interfemoral membrane and at bases 
of ears the hairs lack the black bases. On ventral surface of body 
the hairs are chaetura black at their bases (except those on the inter- 
femoral membrane, which are entirely buffy brown), with the terminal 
millimeter buffy brown (brightening toward mummy brown on sides 
of body). Ears, wings, and interfemoral membrane blackish. 
Miller (1897), p. 70) gives the typical color of this bat as ‘‘heht 
yellowish gray, paler on the belly, the fur everywhere dark plumbeous 
at base. Membranes, ears, lips, and muzzle blackish.’’ At this time 
Miller recognized the existence of but one race of Myotis californicus 
within the state of California, and his color description is evidently 
taken from examples of the pale desert race, Myotis californicus 
pallidus. 
Skull—Small as compared with skulls of other California species 
of Myotis (12.0 to 13.3 millimeters in greatest length), and delicately 
formed. Brain-ease rounded and forehead sloping gently, forming a 
comparatively deep saddle between brain-case and up-turned rostrum 
(pl. 22, fig. 36). Interorbital constriction narrow (3.0 to 3.2 milli- 
meters in width). Occipital elevation slight. Skull of same general 
type as in Myotis evotis and M. thysanodes, but readily distinguished 
by its much smaller size. Interorbital constriction (pl. 21, fig. 24) 
much narrower in californicus than in yumanensis. In greatest 
leneth of cranium californicus is only slightly smaller than orinomus, 
but in lateral profile the ‘‘flattening’’ of the skull of oriznomus (pl. 22, 
fig. 38) contrasts strongly with the saddle-shape in californicus (pl. 22, 
fie. 836) as formed by the angular outline of the rostrum and forehead. 
Measurements —Ten adult specimens of this bat average in milli- 
meters as follows: total length, 77.6 (extremes, 74.0-83.0) ; tail verte- 
brae, 34.6 (29.0-39.0) ; tibia, 13.2 (12.6-14.0); foot, 6.4 (5.5-8.0) ; 
forearm, 30.8 (30.0-31.6) ; greatest length of cranium, 13.0 (12.4— 
13.3) ; zygomatic breadth, 7.6 (7.1-8.1); breadth of brain-ease, 6.7 
(6.4-7.0) ; interorbital constriction, 3.1 (3.1-3.2). 
Synonymy and History—tThe little California bat was described 
by Audubon and Bachman (1842, pp. 285-287) under the name 
Vespertilio califormecus. The deseribers state: ‘‘We have obtained 
but a single specimen, which was captured at California.’’ Miller 
(18976, pp. 21-22) has shown the description given by Audubon and 
Bachman to be applicable to Myotis californicus alone among the 
