290 VESPERXILIOXID^. 



short and straight, obtusely pointed, inner margin straight, outer 

 margin convex in lower three fourths, straight above. 



Wings from the middle of the tibise, and from the sides of the 

 back almost as dose to the spine as in V. macrotarsus from the Phi- 

 lippine Islands. Interfemoral membrane triangular behind, last 

 caudal vertebra free ; calcaneum weak, concave behind. 



Feet remarkably large, proportionally larger than in any other 

 known species of the genus ; the outer toe much shorter than the 

 others. 



Fur long and dense, extending thinly upon the upper surface of 

 the interfemoral membrane as far as the end of the fourth caudal 

 vertebra, and upon the legs to the ankles. Above, dark brown, with 

 paler extremities ; beneath, a lighter shade of the same colour. 



First and second upper premolars minute, internal to the tooth- 

 row, but distinctly visible from without, the second very much 

 smaller than the first ; second lower premolar very small and quite 

 internal, in the angle between the closely approximated first and 

 third premolar. 



Length (of the type specimen, an adult 2 ), head and body 2"-4, 

 tail l"-9, ear 0"-8, tragus 0"-3, forearm 2"-l, thumb 0"-45, third 

 finger 3"-5, fifth finger 2"-8, tibia 0"-8, foot 0"-7. 



Mab. South America (Montevideo). 



Type in the collection of the Paris Museum. 



2. Vespertilio macrotarsus. 



Vespertilio macrotarsus, Waterhouse, Arm. ^'Maq. Nat. Hist. vol. xvi. 

 p. 51 (1845) ; Waf/ner, Suppl. Schreh. Sauqeih. v. p. 740 (1855) ; 

 Dohson, Monoyr. Asiat. Chiropt. p. 130 (1876). 



Ears slightly longer than the head ; laid forwards their extre- 

 mities extend exactly to the end of the nose ; iimer margin of the 

 conch straight in the lower ascending portion for about one third 

 its length, then regularly convex, with a slight flattening in the 

 upper third ; the outer margin forms a straight line without inter- 

 ruption as far as a point opposite the base of the tragus, terminating 

 in a small lobe opposite the base of the inner margin. Tragus 

 straight and very acutely pointed ; inner margin straight ; lobe at 

 base of outer margin small, succeeded by an emargination, above 

 which the tragus reaches its greatest width (Plate XVIII. fig. 1, 

 ear, enlarged). 



Wings to the ankles ; feet very large, the claws of an intensely 

 black colour, contrasting with the prevailing hght brownish hue of 

 the integuments. Calcaneum very long, extending to within a very 

 short distance of the tail. The wing-membranes are attached to the 

 sides of the bade at a distance of about a quarter of an inch from 

 the spine on each side ; and the surface covered by hairs across the 

 loins is scarcely more than half an inch in width. 



Fur above dark brown, with paler tips ; beneath, canary-colour, 

 the bases of the hairs dark. The fur is everywhere very short, and 

 scarcely extends to either the wing- or interfemoral membrane. 



