88 THE AMERICAN CHARACIDAE. 



13. Moenkhatjsia barbouri Eigenmann. 

 Plate 7, fig. 1; Plate 100, fig. 1. 



Moenkhausia barbouri Eigenmann, Bull. M. C. Z., 1908, 62, p. 103 (Villa Bella); Rept. Princeton 

 univ. exped. Patagonia, 1910, 3, p. 437. 



Habitat. — Amazon Basin. 



Specimens examined. 



3723 C. 1 64 San Antonio, Rio Madeira Haseman 



Very similar to M . grandisquamis, the striae of the scales are different and 

 the caudal lobes dark. 



Head 4.2-4.3; depth 2.4; D. 11; A. 30-33; scales 5.5-37-4.5. Eye 2.5; 

 interorbital slightly smaller than eye. 



Compressed, moderately deep, the dorsal and ventral profiles symmetri- 

 cally curved, without humps or depressions; preventral area rounded, with 

 obscure lateral keels; postventral area narrowly rounded; predorsal area 

 obscurely keeled, with a median series of nine scales from the dorsal to the 

 occipital process. 



Occipital process equals one fourth the distance from its base to the dorsal, 

 bordered by three scales on the sides; the occipital fontanel continued as a 

 groove to its tip; interorbital distinctly convex; second suborbital leaving but 

 a very narrow naked border; maxillary 2.66 in head, equal to the distance from 

 the tip of the snout nearly to pupil; four teeth in the front series of the pre- 

 maxillary, five teeth in the second series; maxillary with a single tooth. Lower 

 jaw with four large teeth in front and several minute ones on the sides. Gill- 

 rakers about 7 + 13, the longest about one fourth of the eye. 



Scales of the sides with four or more diverging striae; anal sheath consist- 

 ing of a single series of scales; caudal lobes scaled for at least half their length; 

 lateral fine nearly straight. 



Origin of dorsal equidistant from tip of snout and base of upper caudal 

 lobe; ventrals equidistant from tip of snout and base of last but four rays of 



