248 Hahn A New Bat From Mexico. 



Interfemoral membrane sparsely furred at base. Wing membranes from 

 the ankle directly opposite the calcar. 



Skull and Teeth. The skull is small with a short broad rostrum, and high, 

 strongly rounded braincase. The palate is wide posteriorly, narrowed an 

 teriorly; posterior palatal projection short and broad. Audital bullse small ; 

 basisphenioid pits deep. The teeth are small and the toothrows short, that 

 portion behind the anterior premolar being so strongly divergent as to form 

 a noticeable angle with the line of the anterior portion. 



Measurements. Type : * Forearm, 39 ; hind foot, 13 ; calcar, 7 ; ear from 

 base, 16; ear from notch, 13; nose leaf without horse shoe, 6.5. Skull of 

 type: Greatest length, 21; basal length, 16.5; greatest breadth, 11; greatest 

 depth, 9.5 , interorbital breadth, 5 ; upper toothrow, 7. 



Remarks. Hemiderma subrufum is a well marked form which does not 

 appear to intergrade with any other known species. In size it is interme 

 diate between the Hemiderma castaneum of H. Allen and the large Mexican 

 species called nzteca by Saussure.f The body is small and the limbs slender 

 and short (forearm 39 as compared with 42 given by Saussure). It also differs 

 markedly in cranial characters from azteca, the skull being not only shorter 

 and smaller but of a very different aspect, the braincase rising abruptly 

 above the level of the rostrum, its sides flaring ont in a broadly rounded 

 arch and the palate and rostrum being relatively much broader. The teeth 

 also are much lighter; the toothrow is shorter by a millimeter and the rela 

 tive proportions of the cusps of some of the teeth differ markedly. 



In addition to the type series from Oaxaca, I have examined specimens 

 in the collection of the Field Columbian Museum from Achotal, Vera Cruz, 

 which do not appear to differ in any essential way from the type. The 

 color is perhaps a little paler but this is an extremely variable character in 

 this genus, in which distinct dichromatism exists. 



* Measurements taken from dry skin. 



t Carollia azteca Saussure, Rev. et Mag.de Zool. 1860, p. 480. Temperate and trop 

 ical Mexico. 



