ALLEN- — BATS FROM NEW MEXICO AND ARIZONA 
157 
retention of this short recurved spicule is probably to be correlated 
with the length of jaws and the consequent uncrowded condition of 
the small teeth, thus allowing sufficient room to prevent the milk tooth 
from being pushed out. 
Elliot in his Land and Sea Mammals of Middle America (1904) 
calls this the ‘‘Tres Marias Island Bat/’ but the supposed record for 
these islands turns out to be erroneous, as the species was really Glos- 
sophaga mutica (see Nelson, 1899, p. 14). 
Myotis velifer (J. A. Allen) 
CAVE BAT 
Mr. Camp captured two males of this species on April 20 in Monte- 
zuma Canon, Huachuca Mountains, at 6000 feet altitude. 
Myotis occultus Hollister 
Hollister’s bat 
Hitherto this rare species has been found only on the west side of the 
Colorado River in extreme southeastern California. Hollister’s two 
specimens were taken ten miles above Needles, San Bernardino County, 
May 14, 1905, and later, in May, 1910, six additional examples 
were collected by an expedition from the University of California. I 
have now to record it for the first time from New Mexico, where Mr. 
Huber obtained a female. May 23, 1920, three miles west of Las Cruces, 
on the Rio Grande. It was shot after dusk, as it flew through an 
orchard and under some large cottonwood trees. Two other bats, 
shot at the same time, and perhaps of the same species, could not be 
found. Dr. Joseph Grinnell, whose expedition obtained the six speci- 
mens noted above, suggests that this species is a late spring arrival in 
the region where it was found, since his party, ‘‘although collecting 
along the Colorado River from February 15 until May 15, failed to 
detect this bat until the first week in May.” It will be seen that Mr. 
Huber’s specimen was captured late in the same month, also. Perhaps 
it may be late in coming out of hibernation, rather than a late migrant 
from any considerable distance southward. 
This species is remarkable among the North American Myotis in 
that the upper middle premolar {pm^) is in process of becoming lost. 
According to Mrs. Grinnell (1918, p. 262), this tooth is absent from both 
sides of the upper jaw in four of the eight known specimens. In the 
