NO. 2013. BATS OF THE GENUS M0L08SU8— MILLER. 91 



MOLOSSUS OBSCURUS Geoffrey. 



1805. Molossus obscurus Geoffroy, Anu. Mus. Hist. Nat., Paris, vol. 6, p. 155. 



Surinam (name definitely applied to specimens from Surinam, one of the 



localities mentioned by Geoffroy, by Temminck, Monogr. de Mamm., vol. 1, 



1826, p. 236-237). 

 1820. Molossus acuticaudatus Desmarest, Mammalogie, p. 116. (Brazil.) 

 1826. Dysopes velox Temminck, Monogr. de Mamm., vol. 1, p. 234. (Brazil.) 

 1850. Dysopes olivaceofuscus Wagner, Abh. Math.-Phys. Classe, k. bayer. Akad. 



Wissensch., Miinchen, vol. 5, p. 202. (Cuyaba, Matto Grosso, Brazil.) 

 1850. D[ysopes\ amplexicaudus Wagner, Abh. Math.-Phys. Classe, k. bayer. 



Akad. Wissensch., Miinchen, vol. 5, p. 202. (Caicara, Matto Grosso, Brazil.) 



Size less than in the large Antillean species; lower leg and foot 

 usually less than 22.6 mm. (21-22.6 mm.; general color a rich brown 

 at least as dark as the burnt-umber of Ridgwav. Specimens exam- 

 ined from eastern Peru (Perene, Dept. of Junin), Brazil (Bahia, 

 Marajo, Para?, San Paulo, Santarem), British Guiana (Berbice), 

 and the islands of Barbados and St. Lucia. 



MOLOSSUS CRASSICAUDATUS Geoffro 



1805. Molossv^ crassicaudatus Geoffroy, Ann. Mus. Hist. Nat., Paris, vol. 6, 

 p. 156, (Paraguay). 



Like Molossus ohscurus but color not so dark (usually approaching 

 the raw-umber of Ridgway). Specimens examined from Paraguay 

 (Tacuaral and Villa Rica). 



MOLOSSUS AZTECUS Saussure. 



1860. M[olossus] aztecus Saussure, Re\aie et magasin de zoologie, ser. 2, vol. 12, 

 p. 283, July, 1860. (Amecameca, Mexico.) 



Like Molossus crassicaudatus but underparts with a decided tinge 

 of drab. Specimens examined from Chiapas (Huehuetan). 



Fourth or pygmseus-groiip.— Smallest members of the genus, with 

 length of forearm ranging from 33 to 37 mm. 



MOLOSSUS BURNESI Thomas. 



1905. Molossus burnesi Thomas, Ann. and Mag. Nat. Hist., ser. 7, vol. 15, p. 584. 

 June, 1905. (Cayenne, French Guiana.) 



According to the description this species differs from all other 

 known members of the genus in the unusual inflation of the braincase; 

 greatest length of skull 16.2 mm., breadth of braincase 8.9. (In 

 other forms with skull of same length the breadth of braincase is 

 about 8 mm.) Known from the t3'pe only; no specimens seen. 



