328 PROCEEDINGS OF THE ACADEMY OF [1898. 



Natalus (Chilonatalus) brevimanus sp. nov. 



Natalus micropus J. A. Allen, Bull. Am. Mus. Nat. Hist., Ill, p. 169, No- 

 vember, 14, 1890. 



Type.— Adult S (in alcohol), No. 15.835, United States National 

 Museum, Old Providence Island, Caribbean Sea. Presented by 

 Chas. B. Cory. 



Specific characters. — Slightly smaller than Natalus micropus Dob- 

 son 1 from Jamaica and with relatively longer ears and shorter 

 fingers. Color apparently paler than in N. micropus. 



General remarks. — Dr. J. A. Allen recorded the occurrence of this 

 bat on the island of Old Providence as long ago as 1890, but with 

 only a single individual at hand, he naturally considered it the same 

 as the Jamaican species. On comparing fifty-seven specimens from 

 Old Providence with three from Jamaica, I find a slight but re- 

 markably constant difference. Taking into consideration the per- 

 fect isolation of the two forms it seems best to apply to them bi- 

 nomial names. The characters are well brought out in the following 

 table of measurements. The apparent lighter color of N. brevimanus 

 may be due to the bleaching effect of alcohol, as I have seen no skins, 

 and both lots of specimens have been preserved for an unknown 

 length of time. 



Micronycteris microtis sp. nov. 



Type.— Adult $ (skin and skull) No. if f f f , United States Na- 

 tional Museum. Collected at Greytown, Nicaragua, by Dr. L. F. 

 H. Birt. 



Specific characters. — Smaller than Micronycteris minutus (Gervais); 

 thumb, foot, calcar and membranes as in M. megalotis Gray ; ear 

 from meatus about half as long as forearm ; middle lower premolar 

 relatively larger than in M. megalotis ; general color wood-brown, 

 scarcely paler on ventral surface. 



Fur and color. — The fur is distributed precisely as in M. megalo- 

 tis, except that there is a slightly more extensive sprinkling of hairs 

 on the dorsal surface of forearm. Fur on middle of back about 10 

 mm. in length. 



Color uniform wood-brown, slightly richer on dorsal surface. 

 Hairs on body both dorsally and ventrally, nearly white through 

 basal third. 



Ears. — Ears densely furred on basal half externally, the fur run- 

 ning up along anterior border to within 5 mm. of tip. Distal half 



1 Proc. Zool. Soc. Lond., 1880, p. 443. 



