1 78 Bulletin American Museum of Natural History. [Vol.111, 



quite different from any heretofore described. Its large size 

 readily distinguishes it from any other known Mexican or North 

 American species of the genus, except V. albescens Geoffroy, 

 which it appears to equal in size, while differing from it almost as 

 widely as possible in coloration, and also greatly in the size and 

 form of the ear, and in the very differently shaped tragus. For- 

 tunately a Maximilian specimen of V. leucogaster Wied, a species 

 currently synonymized with V. albescens (see Dobson, Cat. Chirop., 

 pp. 326, 327), in the American Museum, enables me to make a 

 direct comparison of V. albescens with the present species. 



16. Tespertilio melanorhinus Merriam Seven specimens, 

 four males and three females, Sierra Nevada de Colima, altitude 

 7500 feet, Jalisco, Dec. 6 and 7, 1889. "Taken while drinking 

 at a water-trough." 



The series varies in color above from golden brown to dull 

 yellowish brown, irrespectively of sex, the brightest specimens, 

 and also the darkest, including both males and females. 



The series has been compared with the type of V. melanorhinus, 

 to which the specimens seem distinctly referable. 



17. Saccopteryx plicata (Peters]. This rare species, originally 

 described from a Costa Rican specimen, and only once before 

 reported from Mexico (cf. Alston, Biol. Centr.-Am., p. 29), is 

 represented by two skins (males), and eleven specimens in alcohol, 

 collected at Tehuantepec, Feb. 12, 1890. Of the thirteen speci- 

 mens nine are males and four are females. In the latter the wing 

 sac is rudimentary. 



18. Nyctinomus brasiliensis /. Geoff r. Nine skins and 

 skulls and eight additional skulls, about equally divided between 

 males and females, all from Sta. Cruz del Valle, Guadalajara, Oct. 

 5, 1889, except two, taken at San Pedro, Guadalajara, Oct. 16, 1889. 

 There appears to be no sexual variation in size. 



The length of the forearm varies from 39 to 43 mm., averaging 

 41.3. Traces of a gular pouch are distinctly seen in four of the 

 five males, but there is no indication of it in any of the four 

 females. 



19. PteronotllS davyi Gray. One specimen, male, Plains of 

 Colima, Jan. 15, 1890. 



