266 University of California Publications in Zoology [Vou.17 
Specimens Examined.—The writer has examined 23 specimens 
from the following localities in California: Modoe County: east face 
of Warren Peak, 2; Warner Mts., 1 (Calif. Acad. Sci.) ; Siskiyou 
County: Castle Lake, 2; Mt. Shasta, 8 (U. S. Biol. Surv., 4; Mus. 
Vert. Zool., 4); Nevada County: Independence Lake, 2; Eldorado 
County: Gilmore Lake, 2; Mt. Tallac, 2 (Mus. Comp. Zool., 1; Acad. 
Nat. Sei. Phila., 1); Mariposa County: Merced Lake, 2; Vogelsang 
Lake, 2. 
Comparisons.—M yotis lucifugus altipetens may be distinguished 
from Myotis lucifugus alascensis by the difference in depth of color; 
the shade is mummy brown above in alascensis, isabella color in alti- 
petens. The race altipetens is somewhat intermediate in color be- 
tween the race carissima of the Rocky Mountain region, and alascensis 
of the Northwest. Bats of the lucifugus group may always be dis- 
tinguished externally from those of the longicrus group by the much 
longer tibia of the latter (15.0-16.4 in lucifugus, 17.9-18.9 im longi- 
crus). The skull of longicrus has a much shorter, more sharply 
turned-up rostrum than that of lucifwgus, and the facial angle is 
greater (see pl. 22). The separation between the lucifugus and 
yumanensis groups is not wide, and identification of young individuals 
is not possible without the aid of cleaned skulls. Externally, the 
claws on the foot and thumb are often an aid to identification, being 
in lucifugus much longer, more slender, and more curved. The skull 
of yumanensis is slightly smaller and uniformly more slender than 
that of lucifugus, with the brain-case more inflated in the frontal 
region. 
Natural History.—C. H. Merriam (1899, p. 89) says of the oceur- 
rence of the High Sierra bat on Mount Shasta: ‘‘Common among 
the alpine hemlocks at Squaw Creek Camp, where they were seen 
every night, darting in and out of the flickering light of the camp 
fire.’ When camped at Merced Lake and at Vogelsang Lake, in 
the Yosemite National Park, J. Grinnell and W. P. Taylor secured 
several of these bats. The former states (MS) that one of the speci- 
mens taken was shot at 7:10 on the evening of August 19. This bat, 
which proved to be a male, was flying high, straight down the canyon 
between the lodgepole pine tops, and was being pursued by another 
bat, apparently of the same species. A specimen secured at Vogel- 
sang Lake, altitude 10,350 feet, September 2, was shot at 7:11 pP.m., 
as it was skimming over the surface of the water. 
