90 ORIGIN, ETC., OF THE FAUNA. 
Central America, are about equal numerically to the genera of all the other faim ilies 
put together. 
A few only of the more important genera need be mentioned. 
‘The Vespertilionide are cosmopolitan to the limit of tree-growth. Three familiar 
Old World forms occurring in our area are: Myotis, extending from North America to 
the Argentine; Eptesicus, spreading as far south in America as Guatemala; and L%pi- 
strellus, reaching South Mexico. Corynorhinus, the American representative of the 
Old World Plecotus, ranges from North America into Mexico. Other American 
genera are: Dasypterus, extending from North to South America; Rhogoeéssa, from 
Central Mexico to Venezuela; and Beodon, known only from Jalisco, in Mexico. 
Finally, Antrozous, formerly, but wrongly, affiliated with Plecotus and ranging from the 
Southern States of the Union to Central Mexico, constitutes with the Australasian 
genus Nyctophilus a special subfamily of the Vespertilionide. 
The Molosside are more southern in distribution than the Vespertilionide. In the 
Old World their northern limit is South Europe and Asia. One genus only, Nyctinomus, 
found also in Europe, Africa, Asia, and Australia, reaches America, where it spreads 
from the Southern United States, though Central America, to Chili. Of exclusively 
American genera, Promops and Molossus pass from Mexico into South America, while 
Eumops has a northern range into the Southern States. 
Of the Emballonuride, mainly a tropical family, not one of the Old World genera 
occurs in America, and the American genera (e.g. Saccopteryx, Peropteryx, and 
Diclidurus) extend from Central into South America. 
Of the families confined to America, the Noctilionide contains two genera—one South 
American, the other (Nocti/io) passing northwards to South Mexico; the Natalide and 
Thyropteride contain one genus each, namely Natalus and Thyroptera, ranging 
respectively from South America to Central Mexico and Honduras; the Phyllostomide, 
divisible into several subfamilies, have, broadly speaking, a distribution similar to that 
of the other exclusively American families just mentioned, though some of the genera 
have a wider, others a narrower, range. For example, of the Chilonycterine, Mormoops 
reaches Texas, Chilonycteris and Pteronotus do not go north of Mexico; of the 
Phyllostomine Xenoctenus is only known from Costa Rica, Glyphonycteris passes 
southwards from that country to Peru, whereas Otopterus extends from the Southern 
States of North America to Guatemala; of the Glossophagine, Cheronycteris reaches 
from South America to Arizona. The single species of Halonycteris is known only from 
Costa Rica, while Lichonycteris, also monotypical, has been recorded from N icaragua 
and Guiana, Similarly, in the Stenodermine, the monotypical Centurio and Ectophylla 
are Central American, but the other Central American genera range into tropical 
South America, Finally, the family Desmodontide, or true Vampyres, differing from 
the Phyllostomide by their large shear-like anterior teeth, is represented by two 
genera, Desmodus and Diphyllus, which are distributed from Southern Mexico to 
Paraguay and Brazil. 
