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 Gunther. 

 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) j 'estiva Steindachner, "Chromiden Amazonenstromes," in SB. 

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

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

 Tapajoz; lea; 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- 

 umba) . 



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

 erara; Rio Negro; Descalvados; Carandasihho; 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 Gunther, Catalogue, IV, 1862, 300 (Tropical America). — 

 Boulenger, Boll. Mus. Zool. ed Anat. Comp. Torino, XV, 1900, — (Caran- 

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

 Teffe; Tonantins; Tabatinga). 



