390 MEMOIRS OF THE CARNEGIE MUSEUM 



One specimen, 44 mm. Bartica. (C. M. Cat. No. 2460a.) 

 The characters of the species are given in the key. 



246. Metynnis maculatus (Kner). (Plate LVII, fig. 1.) 



Myletes maculatus Kner, "Famine der Characinen," ii, 1859, 18, pi. 2, fig. 5 (Rio 

 Guapore). — Gunther, Catalogue, V, 1864, 377. — Steindachner, "Flussfische 

 Sudamerika's," ii, 1881, 28 (Maroni River, Guiana). — Eigenmann and Eigen- 

 mann, Proc. U. S. Nat. Mus., XIV, 1891, 61.—? Perugia, Ann. Mus. Genova, 

 (2), XVIII, 1897, 26 (Reyes; Rio Beni).— Vaillant, Bull. Mus. d'Hist. Nat., 

 V, 1899, 154 (Carsevenne). 



Methynnis maculatus Berg, An. Mus. Nac. Buenos Aires, V, 1897, 286 (San Pedro 

 on Rio Parana). 



Metynnis maculatus Eigenmann, Repts. Princeton Univ. Exp. Patagonia, III, 

 1910, 443. 

 Six specimens, 144-176 mm. Lama Stop-Off. (C. M. Cat. No. 1119«-6; 



I. U. Cat. No. 11661.) 



One specimen, 65 mm. Rockstone. (C. M. Cat. No. 2216.) 



Six specimens, 76-83 mm. Twoca Pan. (C. M. Cat. No. 1123a-b; I. U. 



Cat. No. 11643.) 



Iridescent steel-blue above; opercles very bright orange; lower parts white, 



tinged with orange; anal orange in front, fading out behind; margin of caudal 



bluish, with a submarginal orange band, rest of caudal olive; pectorals yellowish. 



Myloplus Gill. 



Myletes (not of Cuvier) Muller and Troschel, Horse Ichth., I, 1845, 22 (asterias). 



— Gunther, Catalogue, V, 1864, 372. 

 Myloplus Gill, Proc. U. S. Nat. Mus., XVIII, 1895, 214, substitute for Myletes 



of Muller and Troschel and of Gunther {asterias by implication). 



Type, Myletes asterias Muller and Troschel. 



Belly trenchant, serrate; premaxillary with two series of teeth, separated from 

 each other; mandible with a pair of conical teeth; a procumbent predorsal spine; 

 adipose fin short; gill-rakers short, lanceolate; dorsal rays 21-31; cheeks largely 

 naked. 



Anal frequently (always ?) bilobed in the male, falcate in the female. 



On account of such a comparatively small number of the species of this genus 

 having been secured no description beyond a brief key to the species is here at- 

 tempted. 



