Sout/i-Americau Mdinmiils. 23 L 



intorniil lobe ; very different to tlie much broader than lonj^, 

 intfinally |)ointcd tootli Hu;uied by Peters. J/' also tending 

 rather towards a quailrani^uh'ir shape, not so distinctly trian- 

 gular as in puaii/d, .1/, longer thnn broad, instead of the 

 converse, with one high antcro-extcrnal cu3[) and a broad 

 posterior basal ledge. 



Forearm 3() mm. 



Skull: greatest length 21; basal length 1»)"5 ; zygomatic 

 breadth 122; mastoid breadth 10-5; palate length 10; 

 front of upper canine to back of vr 7"5. 



J/ab. Novita, Kio S. Juan, Choco, W. Colombia. Alt. 

 150'. 



Ti/pe. Adult m:\le. B.M. no. 9. 7. 17. 40. Original 

 number 135. Collected 28th November, 1908, by M. G. 

 Palmer. 



This species is so different from V. pnsiUa in the shape o£ 

 its teeth as to induce a doubt as to whether it is rightly 

 referred to this genus. Unfortunately the upper incisors, 

 anterior premolars, and posterior lower molars are missing in 

 the only specimen, but, judging from the shape and number 

 of the alveoli, no further material differences besides those 

 above mentioned seem to occur in these missing teeth. In 

 any case, it is not an Artiheus, as shown by the structure of 

 the teeth ; its dental formula is that of Vampyressa. 



Vampyressa thyone, sp. n. 



Size comparatively small. Colour above whitisii brown 

 anteriorly, uniform jiale brown posteriorly, very much as in 

 Mesophylla maccomielli, which we have received from this 

 same region. Under surface paler biown. Facial streaks 

 short and inconspicuous, though pre.-^ent, area round eye pale 

 brown. 



Skull similar to that of V. pusill'i, but smaller. Teeth 

 like those of that animal in shape, except that both the ante- 

 rior premolar and tlie posterior molar in the upper jaw are 

 wider transversely and shorter antero-posteriorly, thedifference 

 in the last-nametl tootli being especially noticeable. 



Forearm of type 32 mm. 



Skull : greatest length 19 ; basal length 15-3 ; zygomatic 

 breadth 11 ; mastoid breadth 9*5 ; palate length 9'2 ; front 

 of canine to back of m* (I'l. 



//«/». (of type). Chimbo, near Guayaquil, Ecuador. Alt. 

 1000'. Other specimens from Choi 6, W. Colombia. 



Jypc. Adult male in alcohol. H.M. no. 97. 11. 7. 77. 

 Collected 30th April, 1897, by \V. Rosenberg. Presented 

 by Oldfield Thomas. 



17^ 



