386 MEMOIRS OF THE CARNEGIE MUSEUM 



Rupununi). — Cuvier and Valenciennes, Hist. Nat. Poiss., XXII, 1848, 297 



(Essequibo). — Eigenmann and Eigenmann, Proc. U. S. Nat. Mus., XIV. 



1891, 59. — Ulrey, Ann. N. Y. Acad. Sci., VII, 1895, 296 (Lower Amazon) .- 



Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 1910, 441. 

 Pygopristis fumarius Muller and Troschel, Horse Ichth., I, 1848, 21, 35, pi. 9, 



fig. 2; in Schomburgk, Reisen, III, 1848, 637 (Rupununi; Essequibo). — Kner, 



"Familie der Characinen," ii, 1859, 27 (Rio Branco). 

 Serrasabno punctatus Schomburgk, Fishes Brit. Guiana, I, 1841, 223, pi. 17. 



Twenty-three specimens, 151-234 mm. Lama Stop-Off. (C. M. Cat. 

 No. 1118a-d; I. U. Cat. No. 11637.) 



Head 3.5; depth 1.66; D. 18 or 19; A. 34-38; scales with pores 87-95; eye 4 in 

 head, 2 in interorbital; abdominal serrse 36 + 4, 33 + 3, 38 + 4, 31 + 4 in four 

 individuals respectively. 



Pumpkin-seed shaped; snout rounded, lower jaw heavy, truncate, its anterior 

 profile forming a continuous oblique line with the snout. Second suborbital leav- 

 ing four-tenths of the cheeks naked ; opercular bones and suborbitals but little striate ; 

 mouth small; teeth nearly symmetrical, with a central lobe and two much smaller 

 lobes on each side; six teeth on each premaxillary, in a single series, the third tooth 

 much smaller than the rest. 



Gill-rakers 9 + 9, small. 



Dorsal broadly rounded, its base equal to its distance from the caudal; adipose 

 short; caudal lobes pointed; anal with its first two or three developed rays slightly 

 prolonged, the rest of the margin of the fin nearly straight; ventrals reaching anal 

 groove, pectorals not quite to ventrals. 



Lateral line decurved; anterior scales of the lateral line largest; rows of scales 

 along the middle of the sides more numerous than the pores in the lateral line, the 

 pores corresponding to the rows of scales on the caudal peduncle and over the 

 posterior fourth of the anal; a wide naked area from the dorsal to the occipital. 



Dorsal faintly spotted. Iridescent steel-blue above. Pectorals, ventrals, 

 and most of the anal brick-red; opercle orange; a narrow margin of the caudal 

 and anal colorless; caudal submarginally orange, ranging to lemon-yellow and olive. 



Subfamily Mylin^e. 

 Catoprion Muller and Troschel. 

 Catoprion Muller and Troschel, Horse Ichth., I, 1845, 22. 

 Type, Serrasabno mento Cuvier. 



Belly serrate; premaxillary with two series of teeth; mandible with a single 

 series of teeth; dorsal falcate; lower jaw projecting, the chin entering the profile. 



