274 Mr. 0. Thomas on 



no doubt an exaggeration. Peters identifies a specimen 

 from Chili with ears 37 x 24 mm. with //. macrotuSj wliile 

 we have none that I can assign to it. unless a very large skullj 

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

 may be referable to it. 



Then follows tlie commonest and most widely-spread 

 species of all, H. montanus, Phil. & Landb. (syn. H. sec/efhH, 

 Peters) — descril)ed from Chili (Cordillera of Santiago), 

 whence Air. WolfFsohn has sent specimens, — which ranges 

 northwards througli Peru to Ecuador and eastwards over 

 the Andes to Cordova {Kemp), Neuquen (Buenos Ayres 

 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 linC^. The colour is a light 

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

 of H. magelJanicus. 



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

 species : — 



Histiotus colomhice, sp. n. 



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

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

 dark as in the far southern s[)ecies H. mayellanicus, the hairs 

 blackish brown basally, washed terminally with pale cinna- 

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

 buflPy (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- 

 exterual 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 specinieu the 

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

 the eiirs, a fold of skiu then becoming visible across the crown (Act. Soc. 

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

 H. montanug, 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 differential character 

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

 series of spirit-specimens. 



