194 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



femoral membrane. The forearm is distinctly furred along outer 

 side near base. No facial stripes are present. The skull is massive, 

 with short rostrum and moderately developed sagittal crest ; in the 

 incomplete zygomatic arches it resembles that of Lonchophylla, but 

 differs widely in other respects. The teeth are $2 in number. 



HEMIDERMA PERSPICILLATUM AZTECUM (Saussure) 



Short-tailed Bat 



Carollia azteca Saussure, Rev. et Mag. Zool., Ser. 2, Vol. 12, pi. 20, fig. I, 

 p. 480, i860. Type from southern Mexico. 



The short-tailed bat is robust, medium sized, and has rather large 

 feet. It varies from dark brown to rusty in color. The forearm 

 measures about 42 millimeters. A much rarer species, Hemiderma 

 castaneum, sometimes inhabiting the same places, is distinguished by 

 smaller size, the forearm being about 5 millimeters shorter. 



Fig. 13. — Hemiderma perspicillatum aztecum 

 No. 1 798 1 1, U. S. Nat. Mus. About nat. size. 



Hemiderma p. aztecum is the bat most frequently met with in 

 Panama. Numbers may be found resting during the day in almost 

 any dark sheltered places, such as caves, tunnels, or the darkened 

 corners of old buildings. 



Near Bas Obispo a colony of several thousand short-tailed bats 

 was located in a tunnel driven by the French for the diversion of a 

 small river. Here they hung in massed clusters from hollowed places 

 in the rock roof about 15 feet above the water. Near the entrances 

 to the same tunnel were smaller numbers of Chilonycteris rubiginosa. 



At Corozal these bats were associated with Glossophaga soricina 

 leachii in a half-dark concrete tunnel roofed squarely over. They 

 were attached to roughened places in the concrete, their bodies in 

 contact with the wall, and their heads turned partly outward. 



Following directions given me by Col. D. D. Gailliard, and accom- 

 panied by W. H. Osgood, I visited the ruins of old Panama in quest 

 of bats February 7, 1912. We entered a vaulted cellar behind high 

 walls overgrown with wild fig trees near the beach path a short dis- 



