eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 413 



The name Macrodon is preoccupied. 



Caudal rounded; no occipital process; no fontanel; no adipose; mouth large; 

 cheeks entirely covered by the suborbitals; teeth all conical; maxillary with a 

 canine and numerous small teeth; premaxillary with a large canine near the sym- 

 physis, a smaller one toward the sides, and numerous conical teeth; palatines with 

 patches of teeth, the outer series enlarged; a detached patch of teeth in front of 

 the palatines; mouth large, maxillary extending beyond the orbit; walls of the 

 air-bladder normal. Supratemporal plate single. 



266. Hoplias macrophthalmus (Pellegrin). (Plate LXII, fig. 1.) 



"Aimara." 

 Erythrinus macrodon (not of Agassiz) Schomburgk, Fishes Brit. Guiana, I, 1841, 



41 (all rivers). 

 Macrodon malabaricus macrophthalmus Pellegrin, Bull. Mus. d'Hist. Nat., XIII, 



1907, 26 (Cayenne). 

 Macrodon trahira (not of Spix) Muller and Troschel, in Schomburgk, Reisen, III, 



1848, 632 (all streams, especially near cascades). 

 Hoplias malabaricus microphthalmus Eigenmann, Repts. Princeton Univ. Exp. 



Patagonia, III, 1910, 448. 



Six specimens, 85-410 mm. Wismar. (C. M. Cat. No. 2173a-c; I. U. Cat. 

 No. 12338a-c.) 



One specimen, 191 mm. Creek below Potaro Landing. (C. M. Cat. No. 

 2174a.) 



Two specimens, 401-460 mm. Maripicru Creek. (C. M. Cat. No. 2175a; 

 I. U. Cat, No. 12339.) 



A head, 114 mm. long. Tumatumari. (I. U. Cat. No. 12340.) 



A head, 152 mm. long. Creek above Rockstone. (C. M. Cat. No. 2176.) 



Three specimens, 94, 95, and 260 mm. Tukeit. (C. M. Cat. Nos. 2177a and 

 2230a; I. U. Cat. No. 12341.) 



Three specimens, 85-87 mm. Malali. (C. M. Cat. No. 2178a-6; I. U. Cat. 

 No. 12342.) 



There is also a specimen in the Berlin Museum collected by Kappler in Surinam. 



The specimen represented by the head from Rockstone was about 500 mm. 

 long. I was told that specimens twice as large are taken in the creeks (which are 

 really good-sized rivers) emptying into the Essequibo River above Rockstone. 

 Schomburgk says they reach a size of four feet. No specimens were taken nearer 

 the coast than Rockstone and Wismar. It is one of the most highly esteemed of 

 the fishes. 



