320 MEMOIRS OF THE CARNEGIE MUSEUM 



For the full bibliography of this species, found from the Orinoco to Buenos 

 Aires and from Para to Iquitos, see the paper by the writer in the Memoirs of the 

 Museum of Comparative Zoology. 



One specimen, 67 mm. Tumatumari. (C. M. Cat. No. 1489.) 



174. Tetragonopterus chalceus Agassiz. 

 " Coregonus amboinensis " Artedi; Ichthyologia, 1738, Species 44. 

 Tetragonopterus chalceus Agassiz, Selecta Gen. et Spec. Pise. Bras., 1829, 70, pi. 



33, fig. 1.— Cuvier and Valenciennes, Hist. Nat. Poiss., XXII, 1848, 140 



(no specimens). — Kner, "Familie der Characinen," i, 1859, 38 (Rio Negro; 



Surinam). — Gunther, Catalogue, V, 1864, 320 (British Guiana; Essequibo). — 



Vaillant, Bull. Mus. d'Hist. Nat., V, 1899, 154 (Carsevenne). — Pellegrin, 



Bull. Mus. d'Hist. Nat., V, 1899, 157 (Apure).— Eigenmann, Repts. Princeton 



Univ. Exp. Patagonia, III, 1910, 438. 

 ? Tetragonopterus artedii Cuvier and Valenciennes, Hist. Nat. Poiss., XXII, 



1848, 128 (Surinam). 

 Tetragonopterus schomburgkii Cuvier and Valenciennes, Hist. Nat. Poiss., 



XXII, 1848, 137 (Essequibo). 

 Tetragonopterus ortoni Gill, Proc. Acad. Nat. Sci. Phila., 1870, 92. 



Four specimens, 58-68 mm. Wismar. (C. M. Cat. No. 1377a; I. U. Cat. 

 No. 11852.) 



Six specimens, 68-71 mm. Bartica. (C. M. Cat. No. 1378a-6; I. U. Cat. 

 No. 11853.) 



Fifteen specimens, 47-76 mm. Tumatumari. (C. M. Cat. No. 1379a-e; I. 

 U. Cat. No. 11854.) 



Eighteen specimens, 50-91 mm. Crab Falls. (C. M. Cat. No. 1380«-/; 

 I. U. Cat, No. 11855.) 



Forty-eight specimens, 41-49 mm. Rockstone. (C. M. Cat. No. 1381a-j; 

 I. U. Cat. No. 11856.) 



Characters as given in the key and figure. For a full account see the Memoirs 

 of the Museum of Comparative Zoology. 



Mcenkhausia Eigenmann. 

 Momkhausia Eigenmann, Smiths. Misc. Coll., Quarterly Issue, XLV, 1903, 145. 



Type, Tetragonopterus xinguensis Steindachner. 



Two series of notched teeth in the premaxillary; maxillary with a few teeth; 

 caudal scaled, its lobes equal, anal naked; lateral line complete, 38 little decurved; 

 scales entire. 



38 Except sometimes in .1/. colinho. 



