eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 329 



Nineteen specimens, 33-46 mm. Konawaruk. (C. M. Cat, No. 1330a-e; 

 I. U. Cat. No. 11803.) 



Forty-one specimens, 35-66 mm. Tumatumari. (C. M. Cat. No. 1331a-,/'; 

 I. U. Cat. No. 11809.) 



Over one hundred specimens, 24-68 mm. Erukin. (C. M. Cat. No. 1332a-z; 

 I. U. Cat. No. 11801.) 



One specimen, 63 mm. Amatuk Cataract. (C. M. Cat. No. 1333a.) 



Three specimens, 38-40 mm. Twoca Pan, Rupununi. (('. M. Cat. No. 

 1334a.) 



Head 3.7-3.8; depth 2.6-3.3; D. 11; A. 23-24; scales 5-34-3.5; eye 2.5-2.75; 

 interorbital about 3 in the head. 



No caudal spot; a very narrow silvery band overlying a dark line; a well-de- 

 fined humeral spot above the third, fourth, and fifth scales of the lateral line. 

 Vertical fins in life more or less tinged with red. 



186. Mcenkhausia copei (Steindachner). 

 Tetragonopterus copei Steindachner, "Flussfische Sudamerika's," iv, 1882, 35, 



pi. 6, fig. 6 (Santarem). — Eigenmann and Eigenmann, Proc. U. S. Nat, 



Mus., XIV, 1891, 53. 

 Mcenkhausia copei Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 



438. 



Twenty-six specimens, 30-56 mm. Wismar. (C. M. Cat. No. 1321a-e; 

 I. U. Cat. No. 11824.) 



Eleven specimens, 33-56 mm. Gluck Island at Rockstone. (C. M. Cat. 

 No. 1322a-c; I. U. Cat. No. 11821.) 



Fifty-three specimens, 27-55 mm. Rockstone. (C. M. Cat. No. 1323a-j; 

 I. U. Cat. No. 11820.) 



Forty-two specimens, 35-45 mm. Twoca Pan, Rupununi. (C. M. Cat. No. 

 1324a-/; I. U. Cat. No. 11823.) 



Head 3.66-4; depth 3.33-3.66; D. 11; A. 18-20; scales 5-32 to 34-3.5; eye 

 2.5-2.75 in the head, interorbital 3 or a little more. 



No caudal spot; a very narrow silvery band overlying a narrow dark band, 

 which becomes wider in front, sometimes expanded into a humeral spot over the 

 fourth scale of the lateral line; caudal rose-colored or rusty in life. 



Pristella Eigenmann. 

 Pristella Eigenmann, Bull. Mus. Comp. Zool., LII, 1908, 99. 

 Type, Holoprisles riddlei Meek. 



