up from the American Museum of Natural History. On May
4 he set the bat net across Allee Creek at the beginning of the Barbara
Lathrop Trail, and from May 5 to 27 he set the net in the Termite
Cemetery where it was mounted between two small trees with its lower
edge approximately 5 feet above the ground. Unless otherwise stated,
specimens were caught in this net.

On Barro Colorado Island one aim is to preserve the biota and natural
conditions with as little interference from man as possible.
Consequently most of the bats captured were released after being
wing-banded by Jackson with U.S. Fish and Wildlife Service bat bands;
but an attempt was made, with the permission of Mr. James Zetek,
Resident Custodian of the Canal Zone Biological Area administered
through the Smithsonian Institution, to save one or a few specimens of
each species for positive identification. Catalogue numbers are of the
University of Kansas, Museum of Natural History, unless otherwise
indicated. We are obliged to Mr. Colin C. Sanborn and Mr. Robert J.
Russell for checking our identifications of the specimens. Assistance
with field work is acknowledged from the Kansas University Endowment
Association, the United States Navy, Office of Naval Research, through
contract No. NR-161-791, and Mr. James Zetek.

Six species of bats were recorded from Barro Colorado Island by
Professor Robert K. Enders in his "Mammalian Life Histories from Barro
Colorado Island, Panama" (Bull. Mus. Comp. Zool., at Harvard College,
78: 383-502, 5 pls., October, 1935). With his list as a starting place
we can offer a revised list as follows:

Saccopteryx bilineata (Temminck).--Nos. 45061, 45062, 45097, and 402 and
404 of Jackson. Nonpregnant female No. 45061 captured on April 3 weighed
7.0 grams; No. 45062 captured on April 4 contained one embryo 22 mm.
long. It was common to see several bats of this species, not in a
cluster but with a few inches of space between any one bat and its
neighbors, on the vertical screens that covered the airways beneath the
eaves of the buildings. A colony was established in Zetek House (a
trail-end house on the western side of the Island), and several
individuals often were seen in the Tower House. As many as 50
individuals could be found at the Van Tyne Big Tree (_Bombacopsis
Fendleri_) where they hung singly in the shaded inter-buttress spaces
and on the exposed trunk sometimes up to a height of 100 feet.
Occasionally several individuals w