14 PROCEEDINGS OF THE NATIONAL MUSEUM VOL.78 



All specimens examined were alcoholics except one skin from Coyote 

 Mountains, Arizona, which, as mentioned above, is immature, and 

 indistinguishable in point of color from specimen of T. mexicana. 



TADABIDA EUROPS (H. Allen) 



1889. Nyctinomus europs H. Allen, Proc. Amer. Philos. Soc, vol. 26, pp. 



558-561, October 4, 1889. 

 1904. Nyciinomops europs Trouessart, Catal. Mamm. viv. foss. suppL, p. 103. 



Type locality. — Brazil, no exact locality given. Lectotype in 

 United States National Museum. 



Type specimen. — Harrison Allen based his description on 20 

 adult alcoholic specimens from Brazil, without exact locality. Ten of 

 these specimens are in the United States National Museum collec- 

 tion. No. 101498, adult female, is therefore chosen as the lectotype. 



Geographic distribution. — Brazil and Venezuela. 



Diagnosis. — The nearest relative of T. europs is T. yucatanica from 

 Yucatan, but T. europs is slightly the smaller of the two. The fur 

 on the back of T. europs is dark (auburn), instead of Vandyke brown 

 (Ridgway 1912) as in T. yucatanica. However, the most noticeable 

 external character of this bat is the peculiar manner of the growth 

 of the fur on the back, where below the arm it does not extend on to 

 the wing membrane, as it does in other members of the American forms 

 of the genus Tadarida; instead, immediately below the humerus there 

 is an abrupt inward narrowing of the fur area into a kind of slender 

 pannel extending down to the base of the tail. This leaves an unusual 

 bare spot on both sides of the back. This character will distinguish 

 this species externally from any other American form of the genus. 



Measurements. — For detailed measurements see tables, pages 22 

 and 27. 



Specimens examined. — One hundred sixty-seven from the following 

 localities: Brazil: no exact locaUty, 10 alcoholics. Venezuela (all 

 specimens from Venezuela are American Museum specimens): 

 Casiquiare Canal, Buena Vista, 7 skins, 1 alcohoUc; Casiquiare Canal, 

 Amapure, 25 skins, 20 alcoholics; Libreto, 15 skins; Paripari, 35 

 skins, Ocamo River, 54 skins. 



Remarks. — When work began on this paper only 10 specimens of 

 T. europs were available for study; however, since that time I have 

 been able to see and examine the splendid collection of 157 specimens 

 secured recently in Venezuela by G. H. H. Tate, of the American 

 Museum of Natural History, New York. Mr. Tate explains in his 

 field catalogue that these bats were collected in splits in the granite 

 rocks along the edge of the Orinoco and Casiquiare Canal in the 

 Province of Amazonas. Collected with bat net spread over crevices 

 in rocks. Very numerous at dusk. 



Tadarida europs departs farther from the standards for the macrotis 

 group than any other species in the group. The manner of the growth 



