﻿LO 



Indiana University Studies 



Nannostomatinae 



Characidium catenatum Eigenmann 

 "Majuca' ? 



15143, I. 

 15142, I. 



Rio Guaire, near Caracas, August 4, 1918 

 Concejo, Rio Tuy, August 1, 1918. 



Tetragonopterinae 

 Hemigrammus marginatus Ellis 

 "Sardina" 



15127, I. Maracay, Rio Bue, July 29. 



15128, I. Isla del Euro, July 11. 



These specimens differ from those in Paraguay and southern Brazil in 

 having not more than one maxillary tooth. The caudal margin or sub- 

 margin is intensely black, the tip in some specimens light. 



15136, I. Type 58 mm. 27 paratype, 33 to GO mm. Concejo, Rio Tiquirito, 



15137, I. Paratype, 45 mm. Maracay, Rio Bue, July 28. 



Head 4: depth 2.16 to 2.5; D. 11; A. 26 to 29; scales 7-35-6; eye 2.5 

 equals interorbital. 



Deep, compressed, ventral profile regularly arched from chin to end 

 of anal, dorsal profile slightly depressed over the eye; preventral area 

 narrowly rounded, postventral area narrowly compressed; predorsal area 

 narrowly keeled, with a median series of slightly notched scales near 

 the dorsal and lateral scales with their edge bent over the middle further 

 forward. 



Occipital process equals one-fourth the distance from its base to the 

 dorsal, bordered by three scales; fontanels rather broad, the frontal 

 fontanel about three-fourths as long as the parietal without its groove; 

 suborbital with a strongly convex margin, the naked area of the cheek 

 increasing in width from the angle of the suborbital forward; maxillary 

 a little less than 3 in the head, mandible very little more than 2; four qv 

 five teeth in the outer series of the premaxillary, five in the inner series, 

 three or four in the maxillary; five teeth of nearly equal size (the last 

 sometimes considerably smaller) in each ramus of the mandible, abruptly 

 smaller teeth on its side. 



5 + 8 gill rakers. 



Scales regularly imbricate, lateral, line but little decurved; anal with 

 a sheath of a few scales along the base of its anterior third or fourth; 

 caudal lobes with but few small scales along the outer part of their basal 

 fourth. Scales with but few divergent striae. 



Fins all large; origin of dorsal equidistant from snout and tip of 

 adipose or caudal, the third, fourth, and fifth rays highest, reaching to 

 the adipose or the caudal; adipose fin well developed; caudal lobes 2.75 to 

 3.25 in the length; anal high, with a distinct lobe in front, the fifth to the 

 seventh ray highest, reaching to the base of the fifth to sixth ray from 

 the last, origin of anal about equidistant from the caudal and the middle 



Moenkhausia pittieri sp. nov. 



"Sardina" 



August 1. 



