Mr. C. T. Ec'ran on new Fishes. 599 



LXXIX. — Description of a new Fish of the Genus 

 Chaitostomus/ro»i Venezuela. Bj C. Tate ReqaNj 'Q.K. 



Chcetostomus anomalus. 



Head raucli depressed, without distinct ridges or promi- 

 nences, its width equal to its length and about one third of 

 the total (without caudal) ; snout with a naked swollen 

 margin, without tentacles ; fold of the upper lip without 

 median prolongation ; barbel very short. Eye very small, 

 its diameter 8-12 times in the length of head, 2|-3| times in 

 the interorbital width. Interoperculura with a few short 

 spines. Thorax and abdomen entirely naked. D. I 7-9, 

 longer than high, the anterior rays scarcely longer than the 

 posterior and |-| the length of head ; adipose fin usually 

 rudimentary or absent, rarely well developed but small. 

 A. I 2-4, smalh Pectoral spine barely reaching the root of 

 the ventral. Caudal obliquely truncated. Scutes of body 

 not keeled, with short marginal spines, about 26 in a longi- 

 tudinal series. Olive-brown above, with light spots in some 

 specimens; dorsal and caudal blackish, sometimes barred 

 WMth rows of light spots. 



Total length 160 millim. 



Numerous examples from Merida, Venezuela, altitude 

 1500 metres, and from the Albirregas and Milla Elvers, 

 above Merida, altitude 3500 metres, collected by Sr. S. 

 Briceiio. 



This species is extremely remarkable in that the adipose 

 fin is usually rudimentary or absent * ; its nearest ally is 

 Ch. microps, Giinther, which has a slightly larger eye, the 

 head much less depressed, and the dorsal fin more elevated. 



LXXX. — Description ofaneio Fish of the Genus Genypterus, 

 ■with Notes on the Allied Species, ^j C. Tate Hegan, 

 B.A. 



Genypterus microstomas. 



Depth of body 8-10 times in total length, length of head 

 about 5 times. Snout as long as or a little longer than eye, 



* Of 235 examples, 14 have a well-developed adipose dorsal, provided, 

 as usual in this genus, with a spine, in 42 it is very small, in 78 more or 

 less rudimentary, and in 101 entirely wanting-. The great majority have 

 I 8 dorsal and cither I 3 or I 4 anal rays. 



