218 THE AMERICAN CHARACIDAE. 



34. Hyphessobrycon ecuadoriensis Eigenmann and Henn. 



Plate 93, fig. 6. 



Hj/phessobrycon ecuadoriensis Eigenmann & Henn, Indiana univ. studies, 1914, no. 19, p. 9 (Vinccs). 



Habitat. — Ecuador. 



Specimens examined. 



Head 3.5; depth 2.6-3; depth of caudal peduncle 7-8; D. 11; A. 22-24; 

 scales about 30 in a longitudinal series, about 11 in a cross-series, but few 

 scales with pores; eye 3 in head, greater than interorbital. 



Compressed, rather deep, caudal peduncle slender. Predorsal area rounded, 

 with a median series of about 11 scales. Preventral area rounded, without 

 distinct median series of scales. 



Skull smooth, fontanels very large; second suborbital with a strongly 

 convex margin, leaving but a narrow naked margin; mouth oblique, terminal, 

 the maxillary short, only two thirds the length of the eye. Premaxillary with 

 six or eight teeth, the lateral one conic the rest all tricuspid, a smaller tricuspid 

 tooth in front of the space between the second and third of the inner series, 

 occasionally between them and forming a continuous series with them. Maxil- 

 lary with none to three minute teeth; mandible with ten or more graduate 

 teeth of which the anterior ones are tricuspid the rest conical. 



Gill-rakers well developed on both arches. 



Origin of dorsal a little behind the middle, its height 4 in the length, adipose 

 well developed; height of anal lobe 4.5 in the length, caudal lobes 3. Origin of 

 anal under middle of dorsal. Ventrals reaching anal or further, pectorals to 

 or beyond origin of ventrals. Lateral line developed on 5 or 6 scales. 



A conspicuous vertical black humeral spot, sides gray, no caudal line, 

 no silvery lateral band or caudal spot, caudal and anal obscurely margined 

 with dark. 



Color in life brilliant; ventrals, anal, and caudal bright cherry-red, dorsal 

 sometimes with less red; region above anal with many cherry chromatophores. 



