EIGENMANN: the freshwater fishes of BRITISH GUIANA 517 



Cotypes, five specimens, 42-61 mm. Konawaruk. (C. M. Cat. No. 2411a-c.) 



Head 3.2-3.33; depth 3.75-5; D. usually XIX,Uf' A. 111,9 or 10. Scales in 

 a series below the lateral line 62-69;*'' eye 4-5 in the head, 1-1.66 in the snout, 

 .75-1.25 in the interorbital. 



Nares nearer the eye than to the tip of the snout, maxillary extending beyond 

 the origin of the eye in all sizes. A dark spot below the eye; a dark band from chin 

 or eye to the opercle, and in the young (and even the old) from the Potaro and 

 Rupununi, to the caudal; an ocellus on the base of the caudal above the end of the 

 lateral line; the humeral spot above the lateral band in all but the smallest (from 

 Amatuk), in which its center is on the lateral band. A submarginal light streak 

 on the dorsal; bases of last dorsal and anal rays with oblique light bars or spots; 

 caudal faintly barred. 



In the smallest (from Amatuk) the lateral band is conspicuous from below the 

 chin to the end of the middle caudal rays, the humeral spot is just creeping up from 

 the lateral band, the caudal spot is ocellated above, but still continuous with the 

 lateral band below, the upper caudal lobe is obliquely crossed by two light bars 

 and an intermediate dark bar. There are a few spots on the head in front of the 

 lateral line, and a faint band from the snout to between the eyes, where it divides, 

 one passing back along either side of the dorsal, as in C. lugubris. 



Sometimes with dark cross-shades on the back or narrow alternating cross- 

 lines on the sides, especially in the Rockstone specimens; dorsal and caudal some- 

 times as in specimens of C. saxaiilis from Wismar. 



In specimens from Trinidad of so-called saxatilis the humeral spot is sometimes 

 continuous with the lateral band and sometimes distinct but always on the lateral 

 line. 



350. Crenicichla wallacei Regan. 



Crenicichla wallacei Regan, Proc. Zool. Soc. London, 1905, i, 163, pi. 14, fig. 2 



(Essequibo). — von Ihering, Rev. Mus. Paulista, VII, 1907, 303. 

 Crenicichla wallacii Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 



477. 



A small species, hitherto known from a single specimen in the British Museum. 

 It was without specific locality. 



It is readily distinguished by the presence of even in the very young, of a 

 distinct caudal spot, and by the short maxillary. 



"* Of thirty-one specimens nine have 18 and twenty-two have 19 spines; seven have 13, twenty-two have 

 14, and two have 1.5 rays. 



«« Three with 62, two with 63, one witli 64, three with 65, one with 66, five with 67, and one with 69. 



