198 Bulletin American Museum of Natural History. [Vol. III.] 



obtained, and its known range extended eastward into Arizona. 

 The wonder now is that so conspicuous an animal should have so 

 long escaped observation. 



It is of course not remarkable that among the comparatively 

 inconspicuous burrowing mammals many new forms should come 

 to light, including some with very strongly pronounced characters ; 

 or that some form of Nyctinomus, known for many years as Cali- 

 fornian on the basis of a single record, should prove common, as 

 has now been recently found. This, although a tropical genus, 

 is well represented near our southern border and thence south- 

 ward. The case, however, is quite different with the Promops 

 section of the genus Molossus, where M.perotis finds a geograph- 

 ical representative in Merriam's M. californicus of Southern 

 California. This immense bat, one of the largest known from 

 America, is now represented by numerous specimens (I have my- 

 self examined nine), and proves to have no very close relation to 

 M. perotis j though of equal size, it differs widely in coloration, 

 and more or less in various points of structure, as shown by direct 

 comparison with Wied's type of M. perotis, preserved in this 

 Museum. 



The present species adds another to the many surprises this 

 general region has recently supplied to the mammalogist, finding 

 as it does its nearest allies at far remote points on the opposite 

 side of the equator. 



