498 MEMOIRS OF THE CARNEGIE MUSEUM 



About five rows of scales on the cheek; scales above the lateral line much 

 smaller than those below it, about seven scales between the end of the lateral line 

 and the dorsal; bases of soft dorsal and anal scaled. 



Pectoral about as long as the head, reaching to above the anterior anal spines, 

 ventral filaments reaching beyond origin of anal. 



A series of seven bands on the sides, the one from end of dorsal to end of anal 

 (the sixth) heaviest and continued on bases of dorsal and anal. A dark band down 

 from the eye; soft dorsal, end of anal, and caudal in the larger specimens spotted 

 with black. 



Mesonauta Giinther. 

 Mesonauta Gunther, Catalogue, IV, 1862, 300. 



Type, Heros insignis Heckel = Heros festivus Heckel. 



Compressed, increasing in width to the posterior half of the dorsal; scales of 

 the lateral line of the same size as those above or below it; lower lip with a frenum; 

 origin of dorsal behind that of the ventral. 



338. Mesonauta festivus (Heckel). 



Heros festivus Heckel, Ann. Wiener Mus., II, 1840, 376 (Guapore). 



Acara (Heros) festiva Steindachner, "Chromiden Amazonenstromes," in SB. 

 Akad. Wiss. Wien, LXXXI, 1875, 93 (Tabatinga; Tonantins; Teffe; Obidos; 

 Villa Bella; Serpa; Gurupa; Tajapuru; Jatuarana; Maues; Guapore; 

 Tapajoz; Iga; Hyutay; Xingu at Porto do Moz; Araguay; Lakes Hyanuary, 

 Alexo, Manacapuru, Saraca, Jose Assu; Lago Maximo). 



Mesonauta festivus Eigenmann and Bray, Ann. N. Y. Acad. Sci., VII, 1894, 619. — 

 EiGENMANN and Kennedy, Proc. Acad. Nat. Sci. Phila., 1903, 535 (Arroyo 

 Trementina). — Eigenmann, Ann. Carnegie Mus., IV, 1907, 145 (Cor- 

 umbd). 



Cichlasoma festivum Regan, Ann. and Mag. Nat. Hist., (7), XVI, 1905, 69 (Dem- 

 erara; Rio Negro; Descalvados; Carandasifiho ; Tocantins). — von Ihering, 

 Rev. Mus. Paulista, VII, 1907, 332. — Eigenmann, Repts. Princeton Univ. 

 Exp. Patagonia, III, 1910, 473. 



Heros insignis Heckel, Ann. Wiener Mus., II, 1840, 379 (Marabitanos, on the Rio 

 Negro). 



Mesonauta insignis GtJNTHER, Catalogue, IV, 1862, 300 (Tropical America). — 

 BouLENGER, Boll. Mus. Zool. cd Anat. Comp. Torino, XV, 1900, — (Caran- 

 dasifiho).— Pellegrin, Bull. Mus. d'Hist. Nat., VIII, 1902, 182 (Manaos; 

 Teffe; Tonantins; Tabatinga). 



