l8o SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



Anthony (1916, p. 373). A few were found by me January 30. 1912, 

 in one of the larger caves of the same series in which Mr. Busck 

 and Mr. Anthony obtained their specimens. They were located near 

 the entrance and seemed rather shy and quick to leave cavities near 

 the roof in which they were resting-. Twenty-three were shot, along 

 with a large number of Hemiderma perspicillatum aztecum, in a 

 French diversion tunnel near Bas Obispo, January 27, 191 2. Here 

 they left the high-vaulted roof and began flying back and forth, in 

 company with the more abundant species, as soon as my boat entered 

 the dimly lighted tunnel which was driven through a hill to turn 

 aside the flow of a small river. 



Specimens examined: Bas Obispo, 23; Rio Chilibrillo (Chilibrillo 

 caves), 25 *; Vijia, 2. 



Subfamily PHYLLOSTOMINAE 

 Genus MICRONYCTERIS Gray 



The members of the genus Micronycteris are small, slenderly 

 formed hats with very large, thin, papery interfemoral membrane. 

 The thin delicate ears are variable in size and are connected by a 

 concealed band across the forehead. The long pelage of upperparts 

 is rusty brownish in color, becoming white basally ; rather long hairs 

 cover the lower inner sides and conspicuously fringe the anterior 

 margins of the ears. Similar in structure and external appearance 

 to Macrophyllum, but hind limbs shorter ; interfemoral membrane 

 similarly extensive, but perforated by the short tail for about half its 

 expanse instead of to near the posterior border as in Macrophyllum ; 

 color rusty instead of dark brownish ; nose leaf prominent, but much 

 narrower than in Macrophyllum. Skull much more slender than that 

 of Macrophyllum-, the anterior nares opening upward as well as 

 forward close behind the base of the incisors. Dentition much as in 

 Macrophyllum, but premolars all well developed. The teeth are 

 34 in number. 



MICRONYCTERIS MICROTIS Miller 

 Nicaraguan Small-eared Bat 



Micronycteris microtis Miller, Proc. Acad. Nat. Sci., Philadelphia, p. 328, 

 July 27, 1898. Type from Greytown, Nicaragua. 



The ears of this bat can be regarded as small only when contrasted 

 with those of its large-eared congener Micronycteris megalotis. The 

 species is rusty brown in general color. The ears when laid forward 



1 Six in collection Amer. Mus. Nat. Hist. 



