eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 395 



Fifteen specimens, 21-55 mm. Warraputa. (C. M. Cat. Nos. 1102a-d and 

 2220a-d; I. U. Cat. No. 11665.) 



Head 3.8; depth 1.7-2; D. 23-25; A. 36-38; scales 43 to about 95-110-34 

 (the latter counted in a series above the lateral line); eye about 4.7 in the head; 

 abdominal serrse 31 -f 4. 



Sides irregularly blotched with black in the adult. 



The young specimens were taken with poison in one of the shutes of the 

 Warraputa cataracts. It is probable therefore that the "Pacu" spawns above the 

 cataracts. 



Subfamily Cynodontin^e. 



Cynodon Spix. 



Cynodon Spix, Selecta Gen. et Spec. Pise. Bras., 1829, 76 (vulpinus and gibbus). 



Type, Cynodon gibbus Spix. 



This species may be recognized among its relatives by its elongate anal. A 

 fantastic fish, the appearance of which suggests a "grafting" of two types, one type 

 being represented from the head to behind the shoulder-girdle, the other from behind 

 the shoulder-girdle to the tail. 



This genus has not before been reported from Guiana. 



251. Cynodon gibbus Spix. 



Cynodon gibbus Spix, Selecta Gen. et Spec. Pise. Bras., 1829, pi. 27.— 

 Cuvier and Valenciennes, Hist. Nat. Poiss., XXII, 1848, 333 (Amazon).— 

 Castelnau, Anim. Am. Sud, Poiss., 1885,75 (Amazon). — Kner, "Familie der 

 Characinen," ii, 1859, 46 (Rio Branco). — Gunther, Catalogue, V, 1864, 359. 

 —Cope, Proc. Am. Philos. Soc, XVII, 1878, 688 (Peruvian Amazon). — Stein- 

 dachner, "Flussfische Sudamerika's," iv, 1882, 15 (Rio Huallaga). — Eigen- 

 mann and Eigenmann, Proc. U. S. Nat. Mus., XIV, 1891, 59. — Perugia, 

 Ann. Mus. Genova, (2), XVIII, 1897, 26 (Rio Mamore).— Fowler, Proc. Acad. 

 Nat. Sci. Phila,, 1906, 467. — Eigenmann, Repts. Princeton Univ. Exp. 

 Patagonia, III, 1910, 444. 

 Five specimens, 115-230 mm. Wismar. (C. M. Cat. Nos. 1249a and 1998a-6; 



I. U. Cat. No. 12245.) 



Two specimens, 240-325 mm. Malali. (C. M. Cat. No. 1997a; I. U. Cat, 



No. 12246.) 



Head 4.75-5; depth 3.4; D. 12; A. 77; scales 145-163 in a series above the 



lateral line. Eye 1 in snout, 3.8 in head, 1 in intcrorbital. 



Compressed, breast trenchant; body deep at the pectorals, long, tapering to 



