110 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxxii. 



minute hairs also scattered over the distal portion; legs and feet 

 thinl}' covered with hairs, a number of stiff hairs at the base of the 

 claws; forearms densely furred at base, the fur gradually becoming 

 shorter and more sparse distalh-; base of thumb well covered with 

 short hairs. Wing membranes from front of tarso-tibial joint, on a 

 level with calcar. 



Ear and tragui:;. — Ears rather short and broad; anterior edge 

 strongly and evenl}^ convex; posterior edge slightly concave in its 

 upper two-thirds; outer side densely furred at base, naked at tip; 

 internal side thinly haired at base; no distinct antitragus. Tragus 

 variable, but usually acutely pointed; external edge with a more or 

 less evident notch about one millimeter from the tip and three small 

 lobes lower down, the upper one sometimes indistinct, the second 

 thickened and glandular; internal edge slightly convex with a gland- 

 ular swelling along the upper part. 



No8e-leaf. — Nose-leaf broad, thick, tapering very sharply from the 

 middle half to the tip, covered on both sides with minute hairs. 



Skull and teeth. — Skull of medium size, but rather heavil}^ built; 

 brain-case rising abruptly from rostrum, broadl}" arched and wide, 

 but not so wide relativel}' as in II. suhrufum; interorbital constriction 

 not pronounced; rostrum generally broad and flat, in certain specimens 

 from JMaranhao, Brazil, it is markedly narrow and pinched; teeth 

 moderately heavy; the second upper premolar with a posterior elon- 

 gation which, however, does not form a distinct heel or secondarj^ 

 cusp; teeth placed closely together, but not overlapping; line of 

 maxillary tooth-row not sharply curved; last upper molar with or 

 without a distinct posterior cusp. Mandibles light. 



Specimens examined. — Total number 145, from the following 

 localities: 



Paraguay: Sapucay, 23. 



Brazil: Sao Paulo, San Sebastio, M; Maranhiio, 10; Purus River, 1. 



Trinidad: 80. 



Venezuela: Maripa, 2; Ciudad Bolivar, 2; San Julian, 2. 



Ecuador: Paraml)a, 5; Pambilar, 1; San Javier, 1. 



British Guiana: Berbice, 3. 



Colombia: Santa Marta, 10. 



West Indies: Redonda, 3. 



Reinafkn. — This species appears to be the most generalized of anj- 

 of the genus. Although the range here given includes practically all 

 of South America, it is impossible to separate it into more than one 

 form on the basis of the material now at hand. Specimens from 

 Paraguay have a slightly smaller average size than those from farther 

 north and also an average difference in color; but these differences are 

 bridged T)y one or two specimens. The ten specimens at hand from 

 Maranhao, Brazil, show a very great cranial variation, and, were there 



