98 Annals of the Carnegie Museum. 



Lepormus nigrotaniatus (Schomburgk). Scales similar to those of 

 L. fasciatus, but the course apical circuli become transverse, forming 

 low broad arches over the large granular nuclear field, but evanescent 

 apically. 



Leporellin^. 



The single species is unknown to me. 



Nannostomatin^. 

 Boulenger places these with the Anostomatin^e. The scales of 

 P cecilobrycon and Nannostomus are like those of Leporiniis, but with 

 a strong radial system of the type well shown in the figure (Plate 

 XXVI, fig. 4) of P acilohrycon ocellatus. The apical circuli are sub- 

 longitudinal (somewhat oblique), but fail toward the margin. Chara- 

 cidium is entirely different. The following have been studied: 

 Nannostomus marginatus Eigenmann (cotype). A minute fish, about 

 20 mm. long. The scales agree with those of P. ocellatus (Plate 

 XXVI, fig. 4), except that they are rather broader. 

 Pcecilobryon ocellatus Eigenmann (Plate XXVI, fig. 9). The figure 



of a specimen from Rockstone, shows the characters well. 

 Characidium vintoni Eigenmann. A very striking type of scale, 

 quadrate in form, the base gently arched, not crenate or notched, 

 the nuclear area very near the base, about twenty-four long, parallel 

 (somewhat divergent at sides) apical radii, the laterobasal angles 

 approximately at right angles, the relatively coarse circuli running 

 up the sides of the scale, but 7iot invading the field of the radii. With 

 wear, the scales fray out at the apex, and appear dentate. There 

 is, in all, a strong resemblance to the scales of the Gobioniform 

 Cyprinidse, particularly to the genus Pseudogohio. The basal radii 

 are variably indicated by extremely fine lines. 

 Characidium hlennoides Eigenmann (cotype). The scales are in 

 general similar to those of C. vintoni, but are distinctly triangular, 

 the three sides about equal, the lateral margins convex, the apex 

 very obtuse. The circuli seen in the broad laterobasal fields, are 

 very widely spaced; the apical radii are greatly reduced in number, 

 being only about eight. In some scales the field of the apical radii 

 is very finely longitudinally striate, a sculpture very much finer than 

 the circuli, and apparently having nothing to do with them. In many 

 ways the scales of C. hlennoides are curiously like those of Gobio 

 fl,uviatilis; among the Characins they show a certain general ap- 

 proach to Aphyocharax. 



