NO. 5 MAMMALS OF PANAMA— GOLDMAN I75 



SACCOPTERYX LEPTURA (Schreber) 

 Lesser White-lined Jiat 

 Vespertilio lepturus Schreber, Saugethierc, Vol. i, p. 173, pi. 57, 1774. Type 

 from Surinam. 



The lesser white-lined bat closely approaches Saccopteryx hilineata 

 in general appearance, the glossy dark brown or blackish color and 

 two white dorsal lines being about the same. It is a distinct species, 

 however, differing in decidedly smaller size (forearm about 42.3 

 millimeters). 



Two of these bats shot as they circled at dusk over the bank of 

 the Chagres River at Alhajuela, January 29, 191 2, were the only 

 examples secured. This South American species has not previously 

 been recorded from Middle America. 



Specimens examined : Alhajuela, 2. 



Genus PEROPTERYX Peters 

 In general structure this genus is similar to Saccopteryx, but the 

 skull exhibits a much more inflated and generally rotund condition 

 of the rostrum, the back lacks dorsal stripes and the wing sacs are 

 smaller and advanced to near the anterior border of the antebrachial 

 membranes. The teeth are 32 in number. A single species is known. 



PEROPTERYX CANINA CANINA (Wied) 

 Dog-like Bat 



Vespertilio caninus Wieo, Schinz's Theirreich, Vol. i, p. 179, 1821. Type 

 from east coast of Brazil. 



There is nothing especially dog-like about this bat as the name 

 " canina " might be taken to indicate. It is a small species much like 

 those of the genus Saccopteryx in external appearance except that, as 

 indicated under the genus, the dorsal lines present in the latter are 

 absent. 



One was picked up from the ground where it had fallen along with 

 a small number of Saccopteryx bilineata that were dislodged by 

 shooting into dark recesses under the high arch of the natural bridge 

 over the Rio del Puente, a few miles north of Alhajuela. Ten speci- 

 mens in the Field Museum of Natural History were collected at 

 Balboa by Messrs. Osgood and Anderson. This bat, originally 

 described from Brazil and ranging to southern Mexico, is one of the 

 few species that apparently maintain the same characters throughout 

 this wide interval and on the continent show no tendency toward 

 subspecific division. A subspecies, Peropteryx canina phcea, G. M. 

 Allen, has been described from the Lesser Antilles. 



Specimens examined: Balboa, ro; Gatun, i ; Rio del Puente, i. 



