18 G. E. DOBSON 



and ears (the forearm being the same length in both species) , 

 and in the greater extent of tlio interfemoral membrane on 

 the tail of which the cartilaginous extremity of the last vertebra 

 is alone free, contrasting in this respect with V. ìdlariim which, 

 as in V. serotinus:, the last and half the antepenultimate ver- 

 tebra project beyond the membrane. 



The ear-conch is shaped as in V. serolimis but the concavity 

 on its outer side is deeper ; the tragus reaches its greatest width 

 opposite the baso of its inner margin, it is attenuated upwards 

 and subacutely pointed, its outer side is strongly convex in "its 

 lower third, nearly sti-aiglit in its upper two-thirds, the upper 

 third of the inner margin is faintly concave, at the base of the 

 outer margin is a rounded triangular lobule. The post-calca- 

 neal lobule is well-developed. Wings from the base of the toes. 



The teeth, also, are as in V. serotinus; the inner upper in- 

 cisor on each side is long and bifid, the outer small, slender, 

 and unicuspidate, scarcely half the length of the inner incisor; 

 the single upper premolar is lai'ge and close to the canine ; the 

 lower incisors are trifid and at right angles to the direction of 

 the jaws, but not much crowded. 



Fur dark brown above, with the extreme tips slightly paler; 

 beneath also dark brown but the tips are paler ; the fur of the 

 body scarcely extends anywhere upon the membranes either 

 above or beneath. 



Length (of an adult female) head and body T'.O, tail 1". 4, 

 ear 0".58, tragus 0".3, forearm 1".15, thumb 0".27, third 

 finger (metacarp. 1".3, 1.^' ph. 0".45, 2.'"^ ph. 0".7) , fifth finger 

 (metacarp. 1".2, l.^'ph. 0".3, 2.-"' ph. 0".2), tibia 0".5, calca- 

 neum 0".55, foot 0".3. 



Hah. The Argentine Republic (Missiones Province). 



I have much pleasure in connecting with this species the 

 name of the Marquis G. Doria who has done so much to ex- 

 tend our knowledge of Mammalia. 



