Article XX. NEW BATS FROM TROPICAL AMERICA, 

 WITH NOTE ON SPECIES OF OTOPTERUS. 



By J. A. ALLEN. 



During the last three or four years the Museum has received 

 many bats from Central America, northern South America, 

 and the West Indies, aggregating about 600 specimens, but 

 pressure of other work has delayed until now any serious at- 

 tempt at their identification. On working up this large 

 amount of material it is not surprising to find that it contains 

 a few hitherto undescribed forms. 



In this connection I wish to express my great indebtedness 

 to Mr. Gerrit S. Miller, Jr., Assistant Curator of the Division 

 of Mammalogy, U. S. National Museum, whose great familiar- 

 ity with the American Chiroptera is well known, for valued 

 assistance in determining many of the forms, and for placing 

 at my disposal the large collection under his charge. 



About 200 specimens, representing most of our undeter- 

 mined species, were taken recently to Washington for direct 

 comparison with the identified material of the National 

 Museum. 



Molossus coibensis, sp. nov. 



Type, No. 18731, $ ad., Coiba Island, Republic of Panama, June 3, 

 1901; J. H. Batty. 



Much smaller and much blacker than M, obscurus but with more 

 massive skull and much heavier dentition. 



Above deep blackish brown, a little lighter beneath; many shades 

 darker throughout than any specimen of M. obscurus in a series of 

 nearly a hundred specimens from Suapure and vicinity, Venezuela. 

 Forearm 35 mm. (34.5-36 in three specimens), against 38 in obscurus; 

 first metacarpal 37 (40 in obscurus}; same proportional differences in 

 other external measurements. 



The skull, as compared with that of M. obscurus, is relatively 

 broader and shorter, with broader and shorter braincase, broader and 

 heavier rostrum, and heavier dentition, especially noticable in the 

 upper incisors. The infraorbital foramen is lower and opens more 

 anteriorly. 



[227] 



