88 Bulletin American Museum of Natural History. [Vol. XIII, 



There are males and females in both series ; the males are con- 

 siderably smaller than the females, the length of the forearm 

 averaging in the males 55 mm. and in the females 60 mm. ; 

 metacarpal II in the males, 49 mm., in the females, 53.5 mm. 



3. Chiroderma jesupi, sp. nov. 



Type, and only specimen, No. 14574, 3 ad., skin and skull, Cacagualito, 

 Colombia, May, 1898 ; coll. H. H. Smith. 



Similar in skull and teeth to Chiroderma salvini, but smaller and with no 

 head stripes. 



Above uniform dark brown, the hairs dark brown at base, with a broad 

 median band of ashy white, and tipped broadly with dusky brown ; sides and 

 front of neck and upper part of chest grayish brown, the hairs basally and for 

 the greater part of their length grayish white ; rest of lower surface pale brown 

 to base of pelage, the tips of the hairs slightly grayish. No head stripes and no 

 dorsal line. Ears small, brown. Interfemoral membrane above well haired to 

 near the posterior border, naked below ; wing membrane heavily furred to a line 

 drawn from elbow to knee, as is also the humerus and muscular part of the fore- 

 arm. Wing membrane from the foot. 



The skull is in general similar to that of C. salvini, but smaller, with weaker 

 dentition ; the middle upper incisors, however, are slender, terete, perfectly 

 erect and parallel, thus differing markedly from the same teeth in C. salvini and 

 C. villosum. 



Measurements. "Extent, 350"; forearm, 40; thumb, 10; metacarpal II, 

 36; 3d finger metacarpal, 39, ist phalanx, 15, 2d phalanx, 23, 3d phalanx, 

 19 ; 4th finger metacarpal, 33, ist phalanx, 14, 2d phalanx, 15.5 ; th finger 

 metacarpal, 38, ist phalanx, 10, 2d phalanx, 13 ; tibia, 17 ; foot, 12 ; cal- 

 caneum, 7. (All the measurements, except the first, are from the dry skin.) 



Skull. Greatest length, 24 ; breadth of rostrum at canines, 5.2 ; interorbital 

 breadth, 5.8 ; breadth behind supraorbital processes, 5.8 ; zygomatic breadth, 

 15 ; mastoid breadth, n.6 ; median length of bony palate, 9.6 ; width of same 

 between last molars, 5.6 ; length of upper toothrow (exclusive of incisors), 6.7 ; 

 mandible, 15 ; lower toothrow, 7.5. 



The slender, erect, parallel middle upper incisors serve at once 

 to distinguish this species from any of its described allies. 



Named in honor of Morris K. Jesup, President of the Ameri- 

 can Museum of Natural History, to whom the Museum is indebted 

 for the very large collection of Colombian mammals of which the 

 present fine series of bats forms a part. 



4. Vampyrops vittatus (Peters). Two specimens, Valpa- 

 raiso (altitude 4500 feet), April 29 and June 10. Sex not indicated. 



