NO. 5 MAMMALS OF PANAMA — GOLDMAN l8l 



reach just beyond the muzzle. The forearm measures about 32 

 millimeters. 



The small number of specimens of Micronycteris available from 

 Panama are referred to this form, whose exact relationship to the 

 larger-eared but otherwise similar form M. megalotis of South 

 America and M. m. mexicana c4 Mexico is not very clear. The 

 ears in these specimens are short but rather variable in width and 



Fig. 5. — Micronycteris microtis. 

 No. 198338, U. S. Nat. Mus. About nat. size. 



the skulls, with one exception, are about like those of M. megalotis 

 and M. 111. mexicana. A single individual, apparently like the others 

 externally, has a skull so small that I doubtfully refer it to the same 

 species. This aberrant specimen was collected by R. E. B. Mc- 

 Kenney at Bocas del Toro, whence additional material is, therefore, 

 especially desirable. 



M. microtis ranges in Panama from sea level well up on the slopes 

 of the mountains. An example was taken at Boquete on the southern 

 slope of the Volcan de Chiriqui by W. R. Maxon. In a note accom- 

 panying specimens from Pinogana, at sea level in the Darien region, 

 H. Pittier says : " A fire was made at the base of a hollow tree 

 showing signs of being inhabited. Unfortunately all the bats fell 

 in the fire, so that only two could be saved." 



Specimens examined : Bocas del Toro, 1 ; Boquete, 1 ; Pinogana, 2. 



Genus LONCHORINA Tomes 

 The very long nose leaf and large ears are among the external 

 characters distinctive of the genus Lonchorina. The elongated 

 posterior limbs, and tail reaching posterior border of large inter- 

 femoral membrane, approximate the arrangement of these parts in 

 Macrophyllum. The skull and teeth, however, somewhat suggest 

 those of Chilonycteris with differential details. The interorbital 

 region is deeply depressed on the median line, the nasals, curving 

 upward and over anteriorly, project above the nasal opening; the 

 molars are similar to those of Chilonycteris in general sculpture, the 

 anterior upper premolars are more reduced in size, and the median 

 lower premolars are relatively small as in that genus. The teeth are 

 34 in number. 



