eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 519 



Cychla rutilans Schomburgk, Fishes Brit. Guiana, II, 1843, 142, pi. 5 (Rio Branco). 

 ? Crenidchla vittata Muller and Troschel, in Schomburgk, Reisen, III, 1848, 



626 (Essequibo and Lakes Tapacuma and Capoye). 

 ? Crenidchla Johanna vittata (not of Heckel) Gunther, Catalogue, IV, 1862, 306. 

 ? Crenidchla brasiliensis vittata Pellegrin, "Cichlides," 345, in Mem. Soc. Zool. 



France, XVI, 1903, 381. 

 ? Crcnicihla Johanna strigata Gunther, Catalogue, IV, 1862, 306. 

 One specimen, 140 mm. Amatuk. (C. M. Cat. No. 2231.) 

 One specimen, 86 mm. Warraputa. (C. M. Cat. No. 2232.) 

 One specimen, 100 mm. Crab Falls. (I. U. Cat. No. 12414.) 

 Two specimens; 197-227 mm. Bartica. (C. M. Cat. No. 2233a; I. U. Cat. 

 No. 12415.) 



One specimen, about 160 mm. Rockstone. (C. M. Cat. No. 2268.) 

 One specimen, 300 mm. Tumatumari. (C. M. Cat. No. 2234.) 

 Two specimens, 230-255 mm. Tukeit. (C. M. Cat. No. 2235; I. U. Cat. 

 No. 12416.) 



Two specimens, 50-51 mm. Waratuk. (C. M. Cat. No. 2236; I. U. Cat. 

 No. 12439.) 



Head 3-3.2; depth 4.5-5.33; D. usually XXIII, 16, or rarely XX,15; A. 111,10 

 or 11; scales in a series below the lateral line about 100-109. Eye 5.5 in the head, 

 1.4 in the interorbital, 5 and .8 respectively, in the young; anterior nares half-way 

 between tip of snout and eye. 



Maxillary extending to below the anterior margin of the eye. Scales all ctenoid. 

 A black spot at the base of the middle caudal rays. Adult: uniform dark above, 

 somewhat lighter below; fins uniform. Young (86-140 mm.): second dorsal, 

 caudal, and anal reddish, pectoral yellowish; spots on lower half of cheeks and chin; 

 a narrow line across the chin and snout to eye and from the eye to end of opercle, 

 continued on the side as a broader but less intense band of black, which may be 

 bordered above and below by light; a second dark line from the eye along the upper 

 section of the lateral line, a third from the tip of the snout to between the eyes, 

 then dividing and extending to the end of the head, from where it is continued as 

 a series of small streaks or spots along either side of the dorsal; spots between the 

 second and third stripes on the head; caudal with a black spot at the base of the 

 middle rays, surrounded by an arrow-shaped dark area, this bordered by a light 

 band above and below, beyond this dark again; base of dorsal dusky, a submarginal 

 black band; anal with a dusky margin. 



The smallest specimens have no spots about the head, the lateral band is 



