78 Bulletin American Museum of Natural History. [Vol. XX, 



Above very dark brown; pelage beneath the surface blackish, the 

 hairs individually very slightly tipped with gray, blending with the 

 ground color to give a general effect of very dark brown; below basal 

 two thirds of pelage deep plumbeous, the apical third or fourth lighter 

 or pale brown, the ventral surface being thus decidedly paler than 

 the dorsal; ears and membranes dark brown or blackish. Wing 

 from base of toes; uropatagium naked above, slightly hairy at extreme 

 base below; ears medium, rather pointed, deeply incised on the outer 

 border. 



Measurements. Type, from dry skin: Total length, 73; head and 

 body, 43; tail vertebras, 30; tibia, 11.5; foot, 6.5; forearm, 26; 

 thumb, 4; 3d finger: metacarpal, 31; ist phalanx, n; 26. phal., 10; 

 3d phal., 6.5; ear from meatus, 10; tragus, 5. Another specimen 

 gives the same measurements, and a third is slightly larger. 



Skull, total length, 13.6; mastoid breadth, 6.5. 



My otis chiriquensis is similar in coloration to M. nigricans, 

 and also in the shape of the skull, from which species it is 

 easily distinguished by its much smaller size forearm 26 

 against 34 in nigricans from the same locality. -It seems to 

 be, in fact, a miniature of M. nigricans. 



40. Vespertilio fuscus miradorensis (H. Allen). Three 

 specimens, Boquete, Sept. 8 and 15. 



41. Molossus obscurus Geoffroy. Six specimens: Boque- 

 ron, 2, Oct. 15 and Nov. 20; Coiba Island, 4, June 1-3. 



42. Natalus stramineus Gray. One specimen Coiba 

 Island, June i. 



43. Vampyrus spectrum (Linn.). Two specimens, adult 

 male and female, Boqueron, Dec. i. Expanse, 765, 740; 

 ear, 40, 40. 



44. Phyllostomus hastatus (Pallas). Six specimens, Bo- 

 queron, Oct. 6 and 15, and Dec. 4 and 8. The measurements, 

 given for 3 specimens only, are: Expanse, 2 males, each 650, 

 i female, 630; ear, 12-12.5. 



45. Hemiderma perspicillatum (Linn.). Seventeen speci- 

 mens, Boqueron, Sept. 30 Oct. 6 and Nov. n. 



46. Glossophaga soricina (Pallas). Thirteen specimens, 

 Boqueron, Sept. 30, Oct. 3, Nov. 1-19, and Dec. i and 16. 



