220 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. OG 



the largest of the Molossidae of the region, and in general external 

 appearance is not very unlike the typical genus Molossus, the short 

 thick leathery ears projecting forward and overhanging the eyes in 

 the same way. The forearm measures about 59 millimeters. 



A large colony was found inhabiting the roof of the old police 

 station at Bohio. The bats remained during the day between the 

 corrugated iron roof and the ceiling. Looking through crevices a 

 considerable number could be seen ranged in rows with their heads 

 upward, their backs close to the iron, and their bodies lying flat on 

 the boards. They held on to some extent with their thumbs. The 

 sun was shining and the bats were panting with the almost intoler- 

 able heat radiating from the iron. When disturbed they crawled 

 about with lively shuffling motions, seeking always to keep out of 

 sight in the crevices. They were finally dislodged by tearing off the 



Fig. 23. — Eumops glaucinus. 

 No. 179856, U. S. Nat. Mus. About nat. size. 



roof. Some of them, liberated in a room from which they could not 

 escape, flew round and round and finally hung up by their feet in 

 corners, swinging heads downward in the usual position of bats 

 when at rest. The building was soon torn down and the locality is 

 now submerged in Gatun Lake. 



A specimen collected by August Busck, at Paraiso, was recorded 

 by Miller (1912, p. 26). 



Specimens examined: Bohio, 14; Empire, 1 ; Paraiso, I. 



Genus MOLOSSUS Geoffroy 



Externally the genus Molossus is similar to Molossops, but the 

 Panama forms are distinguishable by their smaller size in comparison 

 with the only known regional representative of the latter. The 

 absence of the conspicuously furred areas present on the upper side 

 of the wing between the forearm and fourth finger in Molossops are 

 distinctive. The skull differs notably from those of Molossops and 

 Eumops in the anteriorly arched braincase and high, trenchant 

 sagittal crest sloping down posteriorly to the low lambdoid ridge. 

 The basispenoid depressions are distinct as in Eumops. The upper 



