624 A Revision of the American Cichlidae. 



Sympliysodon discus Heckel. 



Symphysodon discus Heckel, 1. c. (Rio Negro). Giiuther, Cat. Fish. Brit. Mus., 

 IV, 315, 1862 (river Cupai). Steindachner, Beitr. Kenntn. Chromiden 

 Amazonenstromes, 47, 1875 (Teff6 ; Xingu, near Porto do Moz ; Rio 

 Madeira, near Manes ; Rio Negro). 



18. PTEROPHYLLUJH Heckel. 



Pterophyllum Heckel, Fluss-Fische Bras, in Ann. Wien. Mus., II, 1840, 334 



(scalar is). 

 Plataxoides Casteln., Anim. Nouv. ou Rares de I'Amer. Sud. Poiss., 21 (dumerilii). 

 Type : Platax scalaris Cuvier & Valenciennes. 



The genus is composed of but one species. 



Pteropliylliim scalaris (Cuv. & Val.). 



Platax scalaris Cuv. & Val., Hist. Nat. Poiss., VII, 237 (Brazil). 



Pterophyllum scalaris Heckel, 1. c, 335 (Barra do Rio Negro). Giinther, Cat. 

 Fish. Brit. Mus., IV, 316, 1862 (river Cupai). Steindachner, Beitr. 

 Kenntn. Chromiden Amazonenstromes, 76, 1875 (Santarem ; Monta- 

 legre ; Villa Bella; Obidos ; Coary ; Ueranduba ; Tonantins ; Taba- 

 tinga ; Hyutay ; Xingu ; Lago Manacapuru ; Lago Maximo ; Barra do 

 Rio Negro) . 



Plataxoides dumerilii Casteln au, I. c. (Para). 



