r8 :\Iaj..i- (1. E. II. 'narreft-ITamilton on 



hvancliod rays the lonjrest ; caudal tnincato, the outer rays 

 not producinl. Breadth of body at level of first anal ray 2|-3 

 in the distance froui that point to the caudal. Back with 4 

 dark cross-bands, the first throuu;h the base of the dorsal 

 fin ; I races of dark spots on the fins. 



Three specimens, up to 100 mm. in total length, from 

 Salta, Argentina, collected by Herr J. Steinbach. 



Allied to L latirosfris, which it resembles in tlie notable 

 differentiation of the sexes, the males having a broader head 

 and more obtuse snout than the females, and also the sides 

 of the head armed with bristles and the whole upper surface 

 of the body and of the pectoral fins rough, spinulose. 



The preceding notes may be summarized thus : — 



Plecostomus horridus, Kner, is probably, and P. tenuicauda, 

 Stcind., which is redescribed, is certainly distinct from 

 P. emarghiatus, C. & V. 



Plecostomus Garmmii, Regan, is not equivalent to P. lima 

 atropJnnis, Eigenm., but to P. lima (non Liltken), Eigenm. 



Ancistrus was restricted to A. medians, Kner, and its allies 

 by Gill, not by selection of a typical species, but by diagnosis ; 

 a new species of this genus {A. BovaUii) is described. 



Thysanocara is proposed as a new subgencric name for 

 Xenucara cirrhosuia and its allies. X. brev'ipinnis, Regan, is 

 redescribed. 



A new Loricaria, L. Steinbachi, is described. 



XIII. — Descriptions of Tioo new Species of Pterygistes. 

 By G. E. H. Barrett- Hamilton. 



I FIND amongst the bats in tlie British Museum of Natural 

 History examples of two hitherto undescribed species of 

 Pterygistes — the one from Madeira, the other from the North- 

 western Himalayas. In each of these the skull is very 

 distinct from that of any known form, but I do not attribute 

 great importance to the dimensions of the body, those of 

 spirit-specimens being subject to distortion. The two species 

 may be described as follows: — 



1. Pterygistes maJeirce, sp. n. 



This bat is similar to P. Leishri^ Kulil, of Britain, but 

 perhaps smaller and with quite different skull. The colour is 



