342 VESPEETILIONlDiE. 



brane ; wing- and interfemoral membranes much developed, with 

 numerous dotted lines ; wing-membranes from the inferior surface 

 of the lower end of the tibia and from the base of the calcaneum ; 

 tail very long, wholly enclosed in the interfemoral membrane ; 

 calcanea convex backwards as in Kerivoida ; no postcalcaneal lobe. 



Dentition. Inc. ^, c. |^, pm. 5=2, m. ~. 



Upper incisors in pairs, separated from the canines and also in 

 front, the inner incisors diverging slightly from the outer ones as 

 in Vespertilio ; first and second premolars in both jaws well deve- 

 loped. 



Rcmge. Neotropical Region (Antillean, Mexican, and Brazilian 

 Subregions). 



This genus is evidently the representative of Kerivoula in the New 

 World. In the general form of the head and ears, of the wing- and 

 interfemoral membranes, and even in the teeth, it approaches that 

 genus closely ; but the much greater elevation of the crown of the 

 head, the remarkable shortness of the thumb, the pecidiar form of 

 the tragus, the mode of attachment of the wing-membrane to the 

 hinder extremities, and the position and form of the upper incisors 

 distinguish it at once from all other genera of Vespertilionidse, and 

 even indicate its affinity to some of the genera of Emballonuridse. 



Synopsis of the Species. 



a. Tragus broad at the base, narrow and pointed 



above ; forearm 1"'6 1. N. stramineus, p. 342. 



b. Tragus narrow opposite the base of its inner 



margin, expanded above ; forearm l"-05 . . 2. N. lepidus, p. 344. 



1. Natalus stramineus. 



Natalus stramineus, Gray, Mag. Zool. 8f Bot. ii. p. 496 (1838) ; Tomes, 



P. Z. 8. 1856, p. 178, pi. xliii. 

 P Vespertilio splendidus, Waffner, Wiegm. At-chiv, 1845, p. 148 ; 



Abhandl. Miinch. Ahad. v. p. 208. 



Head long, forehead concave, so that the crown of the head ap- 

 pears to be considerably raised above the face-line ; nostrils forming 

 a rounded ridge along the centre of the upper surface of the muzzle 

 in front, from which the sides of the face slope evenly down towards 

 the upper lip on each side ; nasal apertures close together, oval, 

 opening downwards and forwards ; lower lip broad, reflected out- 

 wards in front, with a central groove and a broad naked horizontal 

 cushion on each side occupying a space extending outwards and back- 

 wards slightly beyond the lower canine. Ears shorter than the head, 

 funnel-shaped ; inner margin of the ear-conch very convex, project- 

 ing forwards more than halfway between the eye and the extremity 

 of the muzzle ; at the junction of the outer and inner margins a short 

 triangular elevation narrowly rounded off forms the tip, outer margin 

 ending abruptly midway between the base of the tragus and the angle 



