100 BULLETIN m, UNITKD STATES NATIONAL MUSEUM. 



wing parallel with and close to body, and scattering white hairs on 

 interfemoral membrane. Thumb pad comparatively small. Feet 

 large, the toes with numerous long hairs. Color (from alcoholic 

 specimen) above, uniform dnrk brown, the membranes paler with 

 narrow strip of buff along lower edge of wings near foot; below 

 slightly lighter than back, the hairs with hghter bases and hghter 

 tips; middle of belly whitish; wing membranes beneath whitish near 

 body and blending into pale brown about middle of wing; inter- 

 femoral membrane beneath whitish or pale buffy. Skull flat, with 

 narrow interorbital region and wide, fiat braincase; emargination of 

 palate between premaxillae comparatively very shght, narrow, and 

 reaching backward to plane of center of canine. Upper incisors 

 large, the inner sides nearly parallel; small upper premolar compara- 

 tively large, in middle of line of row, and considerably higher than 

 cingulum of large premolar; molars robust; lower incisors crowded, 

 the outer ones partially hidden behind the middle pair wiiich have 

 broad bilobed crowns. Measurements: Head and body, 64; tail, 50; 

 forearm, 42; third finger metacarpal, 40.3; first phalanx, 17.6, second 

 phalanx, 16.5; fourth metacarpal, 38.9; fifth metacarpal, 24.5; 

 tibia, 12; foot, with claws, 8.2. Skull: Greatest length, 18.3; condy- 

 lobasal length, 17.2; median basal length, 13.8; zygomatic breadth, 

 11.2; postorbital constriction, 4.1; mastoid breadth, 10.8; depth of 

 braincase, 5.5; mandible, 12.7; maxillary tooth row, including canine, 

 6.9; greatest breadth across maxillary rows, 8.2; greatest breadth 

 across upper canines, 4.9; width of first upper molar, 2.2; entire 

 lower tooth row, 7.9. 



Genus NYCTINOMUS Geoffroy. 



1813. Nyctinomus Geofproy, Desc. I'lfegypte, vol. 2, p. 114. {N. ^gyptiacus.) 



1814. Tadarida Rafinesque, Precis D^couv. Somiol., p. 55. {N. teniotis.) 

 1816. Nyclinomus Oken, Lehrb. Nat., 3ter Theil, 2te Abth., p. 924. {N. xgypti- 



acus.) 

 1914. Tadarida Lyon, Proc. Biol. Soc. Washington, vol. 27, p. 217.' 



The free-tailed bats of the restricted genus Nyctinomus are appar- 

 ently rare in East Africa, as they are not often obtained by collectors. 

 A single species was obtained by the Smithsonian African Expedition. 



NYCTINOMUS iEGVPTIACUS Geoffroy. 



1813. Nyctinomus xgyptiacus Geoffroy, Desc. I'Egypte, vol. 2, p. 128. (Egypt; 

 type in Paris Museum.) 



Specimen. — One in alcohol as follows: 



British East Africa: Juja Farai (Loring). 



Measurements of this important specimen are as follows: Forearm, 

 50 millimeters; skull, greatest length, 20.5; coi:dylobasai lergth, 19.5; 

 zygomatic breadth, 12.2; mastoid breadth, 11.1; depth of braincase, 



> See remarks, p. 71. 



