THE AMERICAN TETRAGONOPTERINAE. 73 



the lower jaw, followed by a few minute ones on the side; maxillary without 

 teeth. 



About 8 + 12 gill-rakers, about one third as long as the eye. 



Scales deeply imbricated, with a few divergent striae; anal sheath of one 

 or two series of scales which are well demarked from the lateral scales; caudal 

 lobes scaled to near their tip; lateral line scarcely decurved; the rows of scales 

 above it and below it parallel with it. 



Origin of dorsal nearer the tip of the snout than the base of the caudal; 

 origin of ventrals a little nearer to the tip of snout than the dorsal, equidistant 

 from tip of snout and about end of anal; highest dorsal ray a little more than 

 three in length, the shortest more than two and a half times in the longest. Anal 

 distinctly emarginate in front, the fourth ray two and three tenths times as 

 long as the fourteenth; ventrals scarcely reaching anal, pectorals to ventrals. 



A dark vertical caudal spot on the base of the caudal, sometimes on base 

 of all but the outermost rays; the spot not continued on the middle rays; a 

 silvery lateral band half as wide as the eye; an ill-defined vertical humeral 

 spot crossing the space between the fourth and seventh scales of the lateral line; 

 no other dark markings; iridescent, silvery, and brassy. 



4. Moenkhausia justae Eigenmann. 



Moenkhausia justae Eigenmann, Bull. M. C. Z., 1908, 52, p. 102 ( ); Rept. Princeton univ. exped. 



Patagonia, 1910, 3, p. 437. 



One specimen 21014 Type 60 mm. 



This species is very similar to M. jamesi from which it differs in having a 

 tooth on the maxillary; the teeth four- or five-pointed, four teeth on each side 

 of the lower jaw. A. 31: scales 7-36-6; the second preorbital much narrower 

 than in M. jamesi. 



The exact locality is unknown. The specimen came with others from 

 Dr. Justa through Major Coutinho and was probably found in the neighborhood 

 of Manaos. 



5. Moenkhausia doceana (Steindachner). 



Plate 14, fig. 1. 



Tetragonopterus doceanus Steindachner, Susswf. sudostl. Bras., 1876, 3, p.. 14 (Rio Doce); Eigenmann 



& Eigenmann, Proc. U. S. N. M., 1895, 14, p. 52; Ulkey, Ann. N. Y. acad. sci. 1895, 8, p. 277. 

 Moenkhausia doceana Eigenmann, Rept. Princeton univ. exped. Patagonia, 1910, 3, p. 437. 



Habitat. — Rio Doce, Rio Mucuri. 



