eigenmann: the FRESHWATER FISHES OF BRITISH GUIANA 421 



Erythrinus Gronow, Mus. Ichth., II, 1754, 6, No. 154, pi. 7, fig. 6; Zoophyl., 1763, 



114. 

 Synodus erythrinus Bloch and Schneider, Syst. Ichth., 1801, 397. 

 Erythrinus erythrinus Eigenmann and Eigenmann, Proc. Cal. Acad. Sci., (2), II, 



1889, 107 (Surinam; British Guiana; Gurupa; Tajapuru; Porto do Moz; 



Santarem; Cudajas; Lago Alexo; Manacapuru; Teffe; Tabatinga; Rio dc 



Janeiro; Ueranduba). — Eigenmann, Repts. Princeton Univ. Exp. Patagonia, 



III, 1910, 448. 

 Erythrinus salmoneus Gronow, Mus. Ichth., 1754, 170 (Surinam). — Gunther, 



Catalogue, V, 1864, 284 (Surinam; Rio Cupai). — Steindachner, "Siisswasser- 



fische d. Sudostlichen Brasilien," iii, 1876, 39 (Gurupa; Santarem; Tabatinga; 



Cudajas; Ueranduba; Tajapuru; Lago Alexo; Manacapuru). — Cope, Proc. 



Am. Philos. Soc, XVII, 1878, 694 (Peruvian Amazon). 

 Erythrinus brevicauda Gunther, Catalogue, V, 1864, 285 (habitat ?). — Cope, Proc. 



Am. Philos. Soc, XVII, 1878, 698 (Peruvian Amazon). 

 Erythrinus longipinnis Gunther, Catalogue, V, 1864, 108 (Essequibo). — Eigen- 

 mann and Eigenmann, Proc. Cal. Acad. Sci., (2), II, 1888, 108. 



There is considerable difference in the size of the fins in the sexes. In the 

 female the dorsal is narrowly rounded behind, the tip reaching the vertical from 

 the middle of the base of the anal ; in the male the second and third ray from the 

 end may be prolonged, reaching the vertical from the tip of the last ray (not the 

 longest) of the anal. Similarly the ventrals in the female fall far short of the 

 anus, while in one specimen they reach the base of the fourth anal ray. It seems 

 very probable, therefore, that Giinther's E. longipinnis is based on a male with 

 the extreme length of fins. 



Six specimens, 90-150 mm. Yacktonick Fall. (C. M. Cat. No. 2l57a-d; 

 I. U. Cat. No. 12326.) 



Nine specimens, 68-170 mm. Aruataima. (C. M. Cat. No. 2160o-/; I. U. 

 Cat, No. 12329.) 



Thirty-seven specimens, 45-170 mm. Holmia. (C. M. Cat. No. 2161a-/; 

 I. U. Cat, No. 12330a-/.) 



Three specimens, 82-144 mm. Savannah Landing. (C. M. Cat. No. 2153a-6; 

 I. U. Cat, No. 12323.) 



Ten specimens, 35-150 mm. Tukeit. (C. M. Cat. No. 2152o-d; I. U. Gat. 

 No. 12322a-6.) 



Two specimens, 88-97 mm. Creek below Potaro Landing. (C. M. Cat, 

 No. 2158; I. U. Cat. No. 12327.) 



