6. VEBPERUGO. 245 



Inc. — g-, pm. 2^12 ) '^^ single uppei- incisor, on each side, close to the canine ; 

 outer lower incisors cylindrical, much nan-ower than the inner and 

 middle pair ; first loiver premolar well developed ; postcalcaneal lobe 

 distinct. Hah. Central America. Subgenus Rhogeessa*. 



50. Vesperugo parvulus. 



Rhogeessa parvula et tumida, Allen, Proc. Acad. Nat. Sci. Fhilad. 

 1S66, pp. 285-6. 



Head very slightly raised above the face-liue; nasal apertures 

 circtdar, directed forwards and slightly downwards ; ears nearly 

 as long as the head, much longer than broad ; ear- conch narrowed 

 in upper third and rounded off above, the lower four fifths of the 

 inner margin is slightlj' but regularly convex, the upper fifth 

 straight, the upper third of the outer margin hollowed out beneath 

 the shortly rounded tip, the lower two thirds regularly convex to 

 the termination about midway between the tragus and the angle 

 of the mouth ; tragus rather long and subacutely pointed ; at the 

 base of the outer margin a distinct rounded small lobe succeeded by 

 an emargination, above which the tragus opposite the base of its 

 inner margin suddenly attains its greatest width, the outer margin 

 sloping thence upwards and inwards to the subacute tip. 



Feet small, wings to the base of the toes ; postcalcaneal lobe 

 shallow ; tip of the tail free. 



Eur, above, pale yellow, with chestnut-browii extremities ; be- 

 neath paler. On both surfaces the fur of the body extends out- 

 wards to about the same extent upon the wing-membrane, as far as 

 a line drawn from the middle of the humerus to the distal third of 

 the femur ; the upper surface of the interfemoral membrane is nearly 

 naked, beneath it has a few very fine and short hairs ; the feet are 

 naked ; the inner side of the concave surface of the ear-conch along 

 the inner margin is clothed with a few hairs ; on the face the space 

 in front of the ears, about the eyes, and the labial glands are nearly 

 naked or clothed with a few long straight hairs only. 



Upper incisors close to the canines, long and slender, the summit 

 slightly notched, the notch disappearing as the tooth becomes worn 

 down ; lower incisors in the direction of the jaws ; central and 

 middle incisors bifid or trifld ; outer incisors much narrower, almost 

 cylindrical, obtuse ; posterior upper molar half the size of the ante- 

 penultimate molar ; first lower premolar three fourths the second in 

 vertical extent, but nearly equal to it in cross section at the base, 

 separated above by a considerable space from the canine owing to 

 the backward projecting cingulum of the latter tooth. 



Length (of an adult 5 , with fcetus in utero), head and body l"-6, 

 tail l"-4 head 0"-55, ear 0"-53, tragus 0"-2S, forearm 1"-15, thumb 

 0"-2, third finger 2"-l, fifth finger l"-55, tibia 0"-46, foot 0"-25. 



» RJwcieessa, Men (Proc. Acad. Nat. Sci. Philad. 1866, p. 285). lu consti- 

 tutine this (?) genus, Mr. Allen remarks that the typical species is allied to the 

 Noctilionidffi { = Emballonuridce). I am quite unable to perceive any characters 

 which ally it to any of the species of that family. 



