ART. 19 BATS OF THE GENUS TADARIDA — SHAMEL 17 



his separation from M. macrotis on supposed larger size; but the 

 measurements I have made of West Indian specimens alone show this 

 difference in size to be of no value. 



The next name applied to specimens from South America was 

 Promops affinis, based on one adult and five young from Colombia. 

 In J. A. Allen's description he has the following to say : 



The skull of Promops affinis, allowing for the immaturity of the specimens, 

 closely resembles, in general form and character of the teeth, that of P. depressua 

 (Ward) from Mexico. The two species are also practically of the same size and 

 proportions, but in color P. affinis is much darker than P. depressus, and has the 

 lower outer lobe of the ear much narrower, and the inflated upper internal border 

 wider. They are obviously closely related forms, but their exact relationship 

 can be determined only on comparison of a larger amount of more strictly com- 

 parable material. 



Miller in 1902 ^ concluded that Nyctinomus nevadensis and Nycti- 

 nomus depressus were the same, and I have found nothing to upset 

 his conclusion. I have examined the skin of the type of Promops 

 affinis, which has no skuU, also adult skins (one each) from Brazil, 

 Ecuador, Arizona, Iowa, and an alcohohc (dried out) from Lower 

 California. In all these specimens the color is argus brown (Ridg- 

 way, 1912), with the exception of the skin from Iowa, which is 

 much darker than the others, near mummy brown (Ridgway, 1912). 

 Five young specimens taken with the type of Promops affinis are also 

 much darker in color than the adult sldn. The fur in each skin is 

 whitish at the base. I have not seen the type of N. depressa, but 

 since the two adult skins from South American are so exactly like the 

 adult skin from Arizona, there is no reason to suppose that the type 

 of the Mexican A^. depressa is different. 



It may be necessary to recognize several local forms when adequate 

 series of specimens are available for measurement of the forearm and 

 tibia ; but at present there is nothing to show that such forms exist. 



8 Proc. Biol. Soc. Washington, vol. 15, p. 250, December 16, 1902. 



