PEOM THE EIO PARAGUAY. 35 



64. Tetragonopterus multiradiatus, Stdr. 

 Descalvados and San Luis. 



65. Tetragonopterus ternetzi. (Plate VIII. fig. 2.) 

 Tetrayonopterus ternetzi, Boulenger, P. Z. S. 1895, p. 528. 



Depth of body If to If in total length, length of head 3J to 2§ times. Diameter 

 of eye 2^- to 2^ times in length of head, twice length of snout, equal to interorbital 

 width ; maxillary toothless, extending to below anterior border of eye. Dorsal 11, 

 originating behind vertical of ventrals, longest rays as long as head. Anal 40-42, 

 deepest anteriorly, longest rays a little shorter than head. Caudal bifurcate. Scales 

 30-33 ^; lateral line complete. Pale brownish, upper surface of head, dorsal, anal, 

 and lower part of caudal region of body blackish ; two blackish vertical bands on upper 

 half of body, the first behind the head, the second below the origin of the dorsal fin. 



Total length 45 millim. 



Several specimens from Descalvados, Matto Grosso. 



66. Tetragonopterus argenteus, Cuv. 

 Descalvados, Matto Grosso ; North Paraguay. 



67. Teteagonopterus lacustris, Liitk. 

 Descalvados and North Paraguay. 



68. Teteagonopterus abramis, Jen. 

 Descalvados. 



69. Tetragonopterus dicheoueus, Kner. 

 San Luis and Descalvados. 



70. Teteagonopteeus agassizii, Stdr. 

 Descalvados and Monte Sociedad. 



71. Teteagonopteeus lineatus, Perugia. 

 San Luis. 



72. Tetragonopterus ulreyi. (Plate VIII. fig. 3.) 



Tetragonopterus ulreyi, Boulenger, P. Z. S. 1895, p. 529. 



Depth of body 2^ to 2f in total length, length of head 0% to 3^ times. Diameter 

 of eye half length of head, twice length of snout, equal to interorbital width ; 

 maxillary toothless, extending to below anterior third of eye. Dorsal 10, originating 



f2 



