Collected by Charles Frederick Hartt. 287 



the caudal and over the space lietween tlie anal and ventral. Anal with first 

 six rays elongate. ^laxillary toothless, extends nearly to the centre of the 

 pupil of the eye. The dark ln■o^\ n lateral l)and deepest colored anteriorly, 

 edged above by a conspicuous sihery ])and. Xo caudal spot or true humeral 

 spot, the anterior end of the lateral band suddenly expands more or less, 

 presenting the appearance somewhat of a humeral spot. 



Head 3j, depth SJ ; eye in the head 2.t, and once in the interorbital. A. 

 20-23. D. 10, scales 32-34. Lateral line incomplete, only aliout Tj scales 

 perforated. 



Habitat: — Para; Brazil. Many specimens 10-20 mm. long. 



110. Tetiagonopterus orljignyaiiiis C'uv. & A'al. 



Cuv. & Yal., XXII., p. 147 (Buenos Ayres) ; Giinther, Cat. Fish. Brit. 

 Mus., v., 317, 1864 ; Eigeura. & Eigenm., Proc. U. S. Xat. Mus., XIV., 53, 

 1891. 



Habitat: — Buenos A3'res. 



111. Tetragonopteius ortoiii Gill. 



Proc. Phila. Acad. >Sci., 92, 1879 (Maranon and Napo) ; Eigenm. & Eigenm., 

 Proc. U. S. Nat. Mus., XIV., 54, 1891. 



Habitat: — Maraiion and Napo. 



112. Teti'agonopterus bartlettii Giinther. 



Ann. Mag. Nat. Hist., XVIII., 30, 1866 (Upper Amazons) ; Cope, Proc. 

 Acad. Nat. Sci. Phila., 260, 1871 (Ambyiacu) ; Eigenm. & Eigenm., Proc. U. 

 S. Nat. Mus., XIV., 53, 1891. 



Hahitat : — Upper Amazons. 



113. Tetragoiioptertis liitkenii Boulenger. 



Ann. & Mag. Nat. Hist., XIX., 173, 1887 (Kio Grande do Sul) ; Eigenm. 

 & Eigenm., Proc. U. S. Nat. Mus., XIV., 53, 1891. 



Habitat: — Rio Grande do Sul. 



114. Teti-agouopteriis erytliroptei'iis Holmberg. 

 Holmberg, Rev. Argent., I., 1891, p. 189 (Kio de la Plata). 

 Habitat : — Rio de la Plata. 



115. Tetragoiiopteriis lieliziauiis Bocourt. 

 Bocourt in Ann. Sci. Nat., 1868, IX., 62 (Belize). 

 Habitat : — Belize. 



116. Tetragoiiopteru!ii cobaiieiisis Bocourt. 

 Loc. cit., 62 (Rivers of Coban). 



Hahitat : — Rivers of Coban. 



