Bats of the Genus Histiotus. 275 



Dimensions of type (measured on skin) : — 



Forearm 49 mm. 



Ear 30 X 19*5. Tragus on inner edge 12. Third finger, 

 metacarpus 44, first plalanx 16, second phalanx 15 ; lower 

 leg and hind foot (c. u.) 31. 



Skull: interorbital breadth 6'6 ; intertemporal breadth 4*6; 

 maxillary tooth-row 6'6. 



Hab. Choachi, near Bogota. 



Type. Adult female skin and skull. B.M. no. 99. 11. 4. 1. 

 Collected 20th August, 1895, by G. D. Child. Presented 

 by Old field Thomas. 



This bat is closely allied to H. montanus, of the mountain 

 regions further south, but differs by its darker colour and 

 the great development of the anterior angle of the upi)er 

 premolar. Should this latter characteristic prove inconstant, 

 it may later be advisable to consider Colombia as a dark 

 subspecies of montanus. 



In the lowlands east of the Andes, besides H. montanus to 

 the south, we have in Bolivia the following : — 



Histiotus laphotis, sp. n. 



Ears very large, as compared with those of H. montanuSj 

 about 32 or 33 mm. in length by 23 to 24 in breadth; 

 transverse connecting-band well developed in middle, where 

 it is about 3 mm. in height. General body-colour, of a 

 specimen skinned out of spirit, rather dark brown (mnmmy- 

 brown), the extreme tips only of the hairs washed incon- 

 spicuously with lighter brown. Hairs of under surface 

 brown basally, dull whitish terminally. On the other hand, 

 while the colour of the fur is dark, much darker than iu 

 H. montanus, the ears and w'ing-niembranes are comparatively 

 light, pale and more or less translucent grey. 



Dimensions of type (measured on spirit-specimen) : — 



Forearm 46 mm. (other specimens up to 51). 



Head and body 54; tail 50; ear 33x24; tragus 11; 

 third finger, metacarpus 42, first phalanx 14, second phalanx 

 14'5 ; lower leg and hind foot 29. 



Skull : greatest length 18-2 ; condylo-basal length 16-8 ; 

 zygomatic breadth 10*8; interorbital breadth 5*4 ; maxillary 

 tooth-row 5*8. 



Hab. Southern Bolivia. Type from Caiza. 



Type. Male in spirit. B.M. no. 97.2.25.1. Collected 

 by Dr. Borelli and presented by the Turin Museum. Four 

 specimens. 



