1904.] Allen, New Bats from Tropical America. 237 



Macrotus bulleri J. A. ALLEN, Bull. Am. Mus. Nat. Hist., Ill, 1890, 

 179; ibid., IX, 1897, 48. The above-mentioned Bolanos speci- 

 mens, and others from Guadalajara, Jalisco, Mexico. 



Otopterus mexicanus MERRIAM, Proc. Biol. Soc. Washington, XII, 1898, 

 18. Tres Marias Islands, Bolanos, Jalisco, and the "State of 

 Morelos," Mexico. 



O. bocourtianus differs from 0. mexicanus in much paler 

 coloration throughout, including the ears and membranes as 

 well as the pelage, and in much larger size, the forearm being 

 3 mm., the third metacarpal 2 mm., the total length of the 

 skull nearly 2.5 mm., and the zygomatic breadth over i mm. 

 longer, respectively, than in mexicanus. In a considerable 

 number of specimens of each examined, the range of individ- 

 ual variation leaves an unbridged gap between the two forms. 



