A Revision of the American Gichlidde, 613 



5. ]¥EETROPI.US Giinther. 



Neetroplus Giinther, Fishes Central America, 469, 1866 (iV. nematopus). 



This genus is known from two species. It differs from related 

 forms in having flat incisor-like teeth. 



Neetroplus nematopus Giinther. 

 Neetroplus nematopus Giinther, 1. c. (Lake Managua). 



IVeetroplus nicaraguensis Gill & Bransford. 



Neetroplus nicaraguensis Gill & Bransford, "Proc. Acad. Nat. Sci. Phila., 1877, 

 186 (Lake Nicaragua)." 



We have not had access to a description of this species, and are 

 therefore unable to give its distinguishing characters. 



6. ACAROPSIS Steindachner. 



Acaropsis Steind., Beitr. Kennt. der Chrom. des Araazonenstromes, 1875, p. 20 

 (nassa). 

 Eigenmann & Eigenraann, Proc. U. S. Nat. Mus., XIV, 1891, p. 68 (name 

 only). 

 Type: Acara nassa Heckel. 



This genus differs from related forms in its greatly protractile 

 snout and short anal. It is nearly related to Retroculus, from 

 which it differs in the characters mentioned in the key. 



Acaropsis nassa Heckel. 



Acara nassa Heckel, Bras. Fluss-Fische, p. 353 (Rio Guapore). Giinther, Cat. 



Fish. Br. Mus., IV, 1862, p. 281 (River Ciipai). 

 Acara (Acaropsis) nassa Steind., Beitr. Kennt. Chromid. Amaz'str., 1875, p. 20 



(Gurupa ; Montalegre ; Tonantins ; Villa Bella ; Santarem ; Teffe ; 



Coary ; Serpa ; Obidos ; Curupira ; Ueranduba. From rivers Tapajos, 



Negro, Xingu, Hyutay, Madeira, Gaapore ; from lakes Alexo, Maximo, 



Jose Assu; Saraca, near Silva ; Manacapuru). E. & E., Proc. U. S. Nat. 



Mus., XIV, 1891, p. 68 (name). 

 Acara cognatus Heckel, 1. c, p. 356 (Barra do Rio Negro). 

 Acara unicolor Heckel, 1. c, p. 357 (Barra do Rio Negro). 

 Centrarchus cyanopterus Rob. Schomb., Fish of Guiana, part II, p. 165, pi. XVI, 



1852. 



Habitat. — Amazons and Guiana. 



