12. YESPEETILIO. 329 



straight, outer slightly convex below, attaining its greatest convexity 

 slightly above the base of the inner margin ; the upper third straight, 

 slanting to the tip. (Plate XIX. fig. 11, ear, enlarged.) 



Wiag-membranes from the metatarsus close to the base of the 

 toes ; feet rather large. Interfemoral membrane between the ends 

 of the calcanea acutely angular ; last vertebra and half the ante- 

 penultimate vertebra of the tail free. 



Above, the fur of the back extends to a short distance only upon 

 the wing-membranes, and upon the interfemoral as far as the end of 

 the second caudal vertebra. Beneath, the wing-membrane is thinly 

 covered as far as from the elbow to the knee ; and the greater part 

 of the interfemoral has short fine hairs scattered over it. 



Pur, above and beneath black or dark brown at the base, pale 

 brown above, the terminal third of the hairs beneath ashy. Ears, 

 wing-membranes, and integuments dark brown throughout. 



The dentition presents no peculiarities. 



Length, head and body l"-65, tail l"-5, head 0"-65, ear 0"-55, 

 tragus 0"-25, forearm l"-4, thumb 0"-28, third finger 2"-6, fifth 

 finger l"-9, tibia 0"-55, foot 0"-H5. 



Other specimens give slightly larger or smaller measurements ; 

 the above have been taken from a $ with/os^its in utero. 



Hah. Nearctic and Neotropical Kegions ; according to Allen, uni- 

 versally distributed throughout the United States. 



I am unable to find in Dr. Allen's descriptions of V. affinis and 

 V. ywmaneiisis any characters sufficient to distinguish them from V. 

 lucifugus. The internal basal lobe of the ear, said by Dr. Allen to 

 be obtuse in V. lucifugus, does not differ sufficiently in the speci- 

 mens of this species, received by the British Museum from the 

 Smithsonian Institute, from that of the other species of the genus to 

 permit of its shape being used as a distinguishing character. 



a. S ad., al. Newfoundland. H. Reeks, Esq. [P.], 



b, c. ad. sk. North America (lat. 49°, long. 119°). 



d. 2 ad., al. Lake Winnipeg. Sir J. Richardson [P.]. 



e. 2 ad., al. North America. Smithsonian Institute. 



f. S ad., al. America. Mr. Douglass's Coll. 



g. (S ad., al. Interior of Brazil. Purchased. 

 h,i. c? & $ ad., al. America. Zool. Soc. [P.]. 



In the ' Proceedings ' of the Academy of Natural Sciences of Phi- 

 ladelphia for August 1866, Dr. H. Allen has described eight (?) new 

 species of this genus from tropical America, arranging them into 

 two groups, thus : — 



o. Interfemoral membrane relatively small; each joint of tail a third 

 shorter than each of /3 ; terminal joint of tail exserted. Colour of 

 membranes and auricle blackish. 1. V. mundus ; 2. V. coneinnus ; 

 3. V. exiguus; 4. V. obscurus. 



j3. Interfemoral membrane relatively large; each joint of tail a third 

 longer than each of a ; terminal joint not exserted (a small tip of 

 cartilage may be exserted); colour of membranes and ear light 

 brown, excepting V. exUis. 5. V. agitis; 6. V. volans; 7. V. exUis; 

 8. V. tenutdorsalis. 



