2 74 The Mammals of Colorado 
of M. californicus by its slightly larger size and very much broader, 
more robust form, the rostrum in particular being noticeably 
broader. This is the palest of the Colorado species of Myotis. 
Distribution. — Austral zones and lower edges of Transition Zone 
from southeastern United States to San Luis Potosi and Michoacan, 
Mexico (Miller I. c). In Colorado it has been taken by Cary on 
Snake River south of Sunny Peak, and at Lily, both localities in 
Routt County. 
Myotis californicus. California Bat 
Vespertilio californicus Aud. and Bach., Journ. Acad. Nat. Set. 
Phila., p. 280 (1842). 
Type locality. — Cahfomia. 
Measurements. — Total length, 3.15 ; tail vert,, 1.5 ; hind foot, 0.22 ; 
forearm, 1.25. Length of skull, 0.5; width, 0.28. 
Description. — (From a specimen taken at Santa Rosa, New Mex- 
ico, May 27, 1903): Interfemoral membrane furred on basal third; 
color above light brown (Miller says light yellowish gray) ; below paler 
and more grayish; ears and membranes blackish. Skull is smaller 
and more lightly built than that of any other Colorado Myotis. 
Brain-case moderately rounded, and the long narrow muzzle fades 
gradually into the gently sloping forehead, and is thus very different 
from that of yumanensis ; the zygomata are widely expanded. 
Distribution. — Austral zones and lower part of Transition Zone 
throughout the western United States and Lower California, east to 
Wyoming and Texas (Miller /. c). There is a specimen in the collec- 
tion of the Biological Survey, taken seven miles east of Antonito, 
Conejos County, at 8,000 feet. I have taken it at.Bedrock, Montrose 
County, at 5,150 feet, and at Van Andert's Spring, Little Fountain 
Creek, El Paso County. Frey has taken it at Salida, Chaffee 
County, 7,000 feet. 
Habits. — Mr. Junius Henderson has lately given me 
some interesting information concerning two bats of this 
species which were found by him and Mr. J. J. Blanchard 
in the Marchioness tunnel in Boulder Caiion, at an elevation 
of 6,200 feet. These bats, which were both females, were 
found in the tunnel, 350 feet from the entrance, beyond the 
frost line, December 22, 1909, and were apparently dormant 
when found. One recovered sufficiently when brought 
indoors to fly about the room, the other lay quietly but 
