EIGENMANN: the freshwater fishes of BRITISH GUIANA 431 



Guiana). — Steindachner, "Die Gymnotidse," 1868, 13 (Essequibo River, 



British Guiana). 



Twentj'-nine specimens, 155-290 mm. Wismar. (C. M. Cat. No. 1742a-e; 

 I. U. Cat. No. 12604.) 



One specimen, 130 mm. Kumaka. (C. M. Cat. No. 1743a.) 



One hundred and fifty-five specimens, 105-300 mm. Botanic Garden. (C. M. 

 Cat. No. nUa-i; I. U. Cat. No. 12605.) 



Twenty-six specimens, 105-300 mm. Georgetown trenches. (C. M. Cat. 

 No. 1745a-e; I. U. Cat. No. 12606.) 



Twenty-four specimens, 110-180 mm. Demerara. (C. M. Cat. No. 1746a-e; 

 I. U. Cat. No. 12607.) 



One specimen, 80 mm. Rupununi Pan. (C. M. Cat. No. 1747a.) 



Four specimens, 120-150 mm. Warraputa. (C. M. Cat. No. 1748a; I U. 

 Cat. No. 12608.) 



Five specimens, 80-135 mm. Chipoo Creek. (C. M. Cat. No. 1749a; I. U. 

 Cat. No. 12609.) 



One specimen, 190 mm. Wismar. (C. M. Cat. No. 1750a.) 



Three specimens, 80-160 mm. Maripicru. (C. M. Cat. No. 1751a; I. U. 

 Cat. No. 12610.) 



Two specimens, 130-190 mm. Creek below Potaro Landing. (C. M. Cat. 

 No. 1752a; I. U. Cat. No. 12611.) 



One specimen, 100 mm. Kangaruma. (C. M. Cat. No. 1753a.) 



One specimen, 92 mm. Savannah Landing. (C. M. Cat. No. .) 



Head 7-10.5, depth 5.2-7 in the length to the end of the anal; anal rays 185, 

 188, 189, 190, 190, 191, 194, 196, 197, 208, 210, 218, 220, 224. 



Snout 3-3.25, interorbital 2.1-3.25 in the head; eye about 2 in the snout, 1.5-3 

 in the interorbital, nearly 6 in the head. 



Head and fore part of the bodj^ rather chubby, caudal region compressed; 

 width of the head 2.25-2.4, depth of the head in the occipital region about 2 in the 

 greatest depth; anus on vertical from anterior margin of the eye; dorsal profile 

 rather convex, ventral profile distinctly convex from tip of snout to middle of 

 anal, beyond this rather straight. 



Snout heavy, short and blunt; mouth moderate; gape medium; jaws about 

 equal, lower included on the sides; teeth present in both jaws; eyes small. 



Caudal peduncle 3.25-4.5 in the total length; origin of the anal about one-third 

 of the pectoral behind the vertical from origin of the pectoral. 



Ground color pale buff; dorsal parts and top of head gray; scales more or less 



