274 Mr. 0. Thomas on 



no doubt an exaggeration. Peters identifies a sjieciraen 

 from Chili with ears 37 x 24 mm. with H. macrotus, while 

 we have none that I can assign to it, unless a very large skull, 

 without skin, sent by Mr. WolfFsohn from near Santiago, 

 may be referable to it. 



Then follows the commonest and most widely-spread 

 species of all, H. montanus, Phil. & Landb, (syn. H. segetMi, 

 Peters)— described from Chili (Cordillera of Santiago), 

 whence Mr. Wolffsohn has sent specimens, — which ranges 

 northwards through Peru to Ecuador and eastwards over 

 the Andes to Cordova (Kemp), Neuquen (Buenos Ay res 

 Museum), Buenos Ayres itself, and Uruguay {Aplin). The 

 ears are of medium size, about 26-28 mm. long by 17-19 in 

 breadth in spirit-specimens. The cross-band on the crown 

 not developed in the middle line *. The colour is a hght 

 greyish brown (wood-brown), very different from the dark 

 of H. magellanicus. 



North of this again there occurs, at Bogota, the following 

 species : — 



s 



Histiotus Colombia, sp. n. 



Most closely allied to H. montanus. Ears about as in 

 that species. General body-colour dark brown, almost as 

 dark as in the far southern species H. mageilanicus, the hairs 

 blackish brown basally, washed terminally with pale cinna- 

 mon-brown. Hairs of under surface brown basally, dull 

 buffy (near "pinkish-buff^^) terminally. Ears of rather a 

 narrow-oval shape, those of the type, when thoroughly 

 relaxed, 30 X 19"5 mm. No median connecting-band per- 

 ceptible. Ears and membranes dark brown. 



Skull rather stoutly built, with broad interorbital region. 

 Upper premolar with an unusual development of the antero- 

 external angle, this forming a marked projection outside the 

 hinder basal point of the canine; many of the other forms 

 of Histiotus have this angle slightly projected forwards, but 

 none so much as in the present one. 



* I am aware of Lataste's observation that on the fresh specimen the 

 connecting cress-band can be simulated by holding up the specimen by 

 the ears, a fold of skin then becoming visible across the crown (Act. Soc. 

 Sci. Chili, i. p. 89, 1892). But he only had before him examples of 

 II . inontanus, and had probably never seen the species in which a com- 

 plete connecting-band is present. Had he done so, he would not have 

 thrown doubt on what is certainly a genuine ditiereutial character 

 between the various species, as may be readily seen by examining good 

 series of spirit-specimens. 



