118 Annals of the Carnegie Museum. 



on the ventral surface near its tip. Fourth ray tapering and termi- 

 nating in an abrupt downward hook. The fifth ray bears dorsally 

 and terminally a series of four retrorse hooks and two rudiments, 



1 5. Neoheterandria elegans Henn, sp. nov. (Plate XIX, figs. 4 and 5.) 

 5823 a, C. M., type, a male, 16.5 mm. Paratypes, 5824 a-g, C. M. 

 One male, 15 mm., six females, 14-16 mm.; 13612, I. U. M. Two 

 males, 14-16 mm., six females, 14-18 mm. Rio Truando, a trib- 

 utary of the Lower Atrato, in Colombia. Charles E. Wilson. 

 An exceedingly minute fish, greatly resembling Heterandria formosa 

 in size, coloration, and general appearance. Its small size makes an 

 accurate description difficult. 



Head 4; depth at origin of anal in females 4.5, in males about 4-4.5; 

 depth of caudal peduncle 6-7 in length to base of caudal. Eye large, 

 about 2.3 in head and slightly less than interorbital. Snout short, 

 1.3 in eye. Cleft of mouth vertical, lower jaw the longer. 



D. 8; A. 10; scales 28 in longitudinal series, about 8 in transverse. 

 Origin of dorsal over last ray of anal in females, equidistant from 

 the base of caudal and upper angle of gill-opening. Origin of anal 

 in females equidistant from the base of the caudal and the center of 

 the eye. The long modified anal of the male arises at the anterior third 

 of the total length and is about equal in length to one-third of the length 

 of the fish. The ventrals of males are minute and thoracic and barely 

 reach to the base of the anal. 



Coloration, similar to that of Heterandria formosa, in having a series 

 of from six to nine vertical bars, beginning just posterior to the visceral 

 cavity, differing irom formosa in having the second bar above the center 

 of the anal in females (above the ends of the posterior anal rays in 

 males) broadened to form a conspicuous vertically oval black spot. 

 Dorsal and anal barred or banded with blackish. 



None of the females are pregnant. They may not be mature. 



Genus Pseudopcecilia Regan. 

 Pseudopcecilia Regan, Proc. Zool. Soc. London, 1913, p. 995. text-fig. 170 F. 



Type, Pcecilia festce Boulenger. 



This genus is very closely related to Heterandria and is in reality 

 connected with that genus through Neoheterandria. 



The dentition consists of an outer series of widely spaced, broadened, 

 or expanded, incisors with recurved pointed tips, and an inner series of 



