ALLEN — BATS FROM NEW MEXICO AND ARIZONA 
159 
where by a narrow crack they gained entrance to the space above the 
ceiling. Here, on June 28, he collected 23 specimens by dislodging 
them from their retreat. Of these, 15 were adult females, and the rest 
were well-grown young, probably at least a week or two old, the largest 
with short hair, and nearly a third adult size. Curiously, all but 
one of these eight young were males. The absence of adults of the 
latter sex may indicate that there is a segregation of the sexes at this 
season. A few were also found with a colony of free-tailed bats in 
a cave 15 miles northwest of Las Cruces, New Mexico, (opposite 
Shalem Colony). ‘‘The cave is about 50 feet deep by 30 feet wide, 
16 or 18 feet high at the entrance, the roof sloping back to the 
floor in the rear. It is evidently of volcanic origin as the whole 
face of the hill is black and looks like lava. An arroyo rises at 
the entrance of the cave. The floor is covered with bat guano to the 
depth of a foot or more in places. Several of these bats were driven 
from crevices in the cave but managed to hide so that they could not 
be located again. 
Sharing the cave with the brown and free-tailed bats, were ten pairs 
of chff swallows with their mud nests attached to the ceiling near the 
entrance. . A great horned owl was collected in the cave. 
Nycteris cinerea (Beauvois) 
HOARY BAT 
Very little is deflnitely known of the breeding range of the hoary bat. 
In the eastern United States it is generally believed to be a migrant 
only; or from the Carolinas southward, a wintering species, breeding 
probably in Canada and perhaps the northernmost of the states. For 
California, however, Mrs. Grinnell (1918) supplies three July records 
out of a total of 55 for that State, and these three are all of adult males. 
In Mr. Huber’s collection are two adult females which he found hang- 
ing in willows, five miles west of Las Cruces, New Mexico (3800 feet 
altitude), both on August 27, 1920. The discovery of two at the same 
locality on this date, suggests that they were early migrants just arrived 
from the northward. The same trees had been carefully searched for 
warblers the day before. Yet there is also some evidence that the species 
is present all summer in parts of the Southwest, for Mr. Camp’s collec- 
tion contains an alcoholic male from the Huachuca Mountains, taken 
June 26, at an elevation of 5200 feet. In addition, W. W. Price re- 
ported it “not uncommon” in the Huachuca Mountains during the 
JOUBNAL OF MAMMALOGY, VOL. Ill, NO. 3 
