228 Bulletin American Museum of Natural History. [Vol. XX, 



Based on four specimens from Coiba Island, Panama, 

 formerly referred (antea, p. 78) to M. obscurus, but on re- 

 examination they prove to be distinctly different. 



The ventral surface of M. coibensis is as dark as the dorsal 

 surface in the darkest specimens of M. obscurus, while the 

 dorsal surface is nearly black. The difference in size, and the 

 strongly marked cranial differences, readily distinguish it 

 from M. obscurus, the only species with which it needs com- 

 parison. 



Molossus bondae, sp. nov. 



Type, No. 23661, $ ad., Bonda, Santa Marta, Colombia, Feb. 10, 1900; 



Herbert H. Smith. 



Intermediate in size between Molossus pretiosus and M. obscurus, 

 but nearer the latter. Above (type) reddish brown, clouded with 

 darker; below paler, light reddish brown, slightly mottled with 

 darker. Forearm and metacarpal III respectively 3 and 4 mm. 

 (about one-twelfth) longer than in M. obscurus, and all the other ex- 

 ternal measurements proportionally greater. The skull is much larger, 

 and relatively very much broader, with larger braincase, much wider 

 palatal fossa, in correlation with the greater breadth of the skull. 

 Compared with a large old skull of obscurus, the measurements are as 

 follows: Total length, 18 mm. (in obscurus 16, in pretiosus 20.5); 

 zygomatic breadth, 13 (in obscurus n); width of braincase, 9.5 (in 

 obscurus 9) ; width of palatal fossa, 3 (in obscurus 2.5). The dentition 

 is correspondingly heavier, but the first premolar is conspicuously 

 relatively much enlarged. The disparity in size is also especially 

 striking in the lower jaw, which is one tenth longer in bondce, with a 

 corresponding increase in depth and in the size of the teeth. In re- 

 spect to volume, the skull of obscurus is about one-half that of bonda, 

 and the skull of bonda about one-half that of pretiosus. 



Represented by the type (skin and skull) and three topo- 

 types (in alcohol) , collected by Mr. Francis C. Nicholas. The 

 latter are dark brown, showing that the species is dichro- 

 matic, like M. pretiosus. 



Promops barbatus, sp. nov. 



Type, No. 17570, $ ad., La Union, Venezuela, Sept. 27, 1901; S. M. 



Klages. 



Near Promops milleri Allen, from Guayabamba, Peru, but smaller, 

 with much narrower skull and lighter dentition. 



