470 On a new Free-tailed Bat from Central America. 



LXII. — A new Free-tailed Bat from Central America. 

 By Gerrit S. Miller, Jr. 



A SPECIES of free-tailed bat represented by two skins from 

 Chiriqui, submitted to me for determination by Mr. Oldfield 

 Thomas, is strikingly distinct from any hitherto known. In 

 size and external appearance it suggests a small " Nyctinomus" 

 of the gracilis-europs group ; but its skull and teeth show it 

 to be a Promops related, notwithstanding its small size, to 

 P. glaucinus. 



Promops nanus, sp. n. 



Type (in British Museum *). — Adult male (skin and skull), 

 no. 56 collection of H. J. Watson, taken at Bogava, 

 Chiriqui, Panama (alt. 250 m.), October 7, 1898. " Caught 

 under the roof of a house." 



Character. — Essentially a miniature of Promops glaucinus ; 

 forearm about 39 millim. instead of 56 millim., greatest length 

 of skull 16*5 millim. instead of 22 millim. 



Muzzle and lips. — So far as can be determined from the 

 dried specimens, after relaxation of the parts, the lips are 

 slightly less w T rinkled than in P. glaucinus, and the pointed 

 horny projections on the ridge above and between nostrils are 

 even smaller and less distinct. 



Ears, — The ears are of the same form as in P. glaucinus ; 

 laid forward they extend about 2 millim. beyond tip of 

 muzzle ; their inner borders arise together on forehead, about 

 5 millim. behind tip of muzzle. In outline the conch is 

 irregularly squarish, the anterior and superior borders about 

 equal in length, the posterior much shorter, the corners 

 bluntly rounded. Antitragus about two thirds as high as 

 wide, its anterior and posterior borders converging regularly 

 toward the bluntly rounded tip, the width of which is a little 

 less than half that of base. Keel well developed, its edge 

 very noticeably thickened. Tragus minute, scarcely more 

 than 1 millim. in length, its highest point at extremity of 

 posterior margin. 



Feet and membranes. — The feet and membranes present no 

 characters of importance. Wing attached at distal extremity 



of tibiae. 



Fur and colour. — The fur is not peculiar either in quality or 

 distribution. On middle of back it is about 5'5 millim. in 

 length. General colour above dark bistre, very faintly washed 



* [Now registered as no. 0. 7. 11. 99.— 0. T.] 



