2l6 SMITHSONIAN MISCELLANEOUS COLLECTIONS VOL. 69 



are slightly larger than in Mexican specimens with which they have 

 been compared, but the external dimensions are about the same. 

 Specimens examined : Boquete, 4.* 



Genus NYCTERIS Borkhausen 

 The genus Nycteris is easily recognizable by the continuation of 

 the dense body fur over the hind limbs and the entire upper side of 

 the wide interfemoral membrane. Distinctive tufts of fur appear 

 also at the upper base of the thumb and along the basal portion of the 

 fourth finger. In the allied genus Dasypterns the interfemoral mem- 

 brane is much less extensively clothed. The skull of Nycteris is short 

 and the rostrum broad and massive, very much as in Dasyptcrits, but 

 a pair of minute upper premolars is not present in the latter genus. 

 The teeth are 32 in number. 



NYCTERIS BOREALIS MEXICANA (Saussure) 



Mexican Red Bat 



A[fa!apha] incxicaua Saussure, Rev. et Mag. de Zool., Ser. 2, Vol. 13, p. 97, 

 March, 1861. Type from southern Mexico. 



The rich reddish brown color of the upperparts, including the fur 

 covering the hind limbs and the entire upper side of the wide inter- 



Fic. 31. — Nycteris borealis mexicana. 

 No. 122663, U. S. Nat. Mus. About nat. size. 



femoral membrane distinguishes this bat from the otherwise similar 

 form, Dasypterns cga panamensis, and all others of the general 

 region. The ears are short and rounded as in Dasypterns. The fore- 

 arm measures about 41 millimeters. 



Bangs ( 1902, p. 50) records a specimen collected by W. W. Brown. 

 Jr., at 4,Soo feet near Boquete on the southern slope of the Volcan de 

 Chiriqui, where the species reaches the extreme southern known 

 limit of its distribution. 



Specimens examined : Boquete, i.- 



* Three in collection Amer. Mus. Nat. Hist.; one in Mus. Comp. Zool. 

 ' Collection Mus. Comp. Zool. 



