108 Annals of the Carnegie Museum. 



of the scales. The detailed structure of the scales is also remarkably 

 similar, both having the same coarse longitudinal circuli in the 

 region apicad of the nucleus, while the radial system is little dif- 

 ferent, except for the well-developed polygonal areas in the Alestes. 

 Plate XXVII, fig. 5 shows the scale of Chalceus macrohpidotus so well 

 that further description is hardly necessary. With regard to the 

 polygonal discal areas of Alestes macrohpidotus, it must be said that 

 they are not wholly distinctive, for the discal region shows some 

 polygonal areas in the Chalceus; it is therefore only a matter of 

 degree. As the figure shows, the basal and lateral circuli are 

 extremely fine. Boulenger places Chalceus in the Hydrocyoninse 

 along with Alestes. 



Lebiasinin^. 



Lebiasina bimaculata Cuvier & Valenciennes (\V. Ecuador). Large 

 reddish scales, about six mm. long and broad, the apical field mi- 

 nutely dotted with dark reddish pigment-spots, stellate in form; 

 laterobasal angles strong; basal middle strongly bilobed, emarginate 

 between the lobes; nucleus very slightly apicad of the middle, 

 from it radiate about ten very strong thick radii, normally three 

 apical, three basal, and two on each side widely spreading, forming a 

 V; apical margin not toothed; lateral and basal circuli twice as fine 

 as apical, the latter coarse, vertical, oblique toward the middle, 

 joining at an acute angle. This is not far from Alestes in scale- 

 characters; among the neotropical types it is essentially as in the 

 Erythrininae. 



Gasteropelecin.e. 



Gasteropelecus sternicla (Linnaeus). Transversely oval scales, with the 

 exposed part shining silvery-green; nucleus central; radii strong 

 but few, one or two apical, and one on each side (or only on one side) 

 lateral, all meeting in the middle; circuli very dense, but wanting on 

 the exposed part of scale; nucleus with fine labyrinthiform sculp- 

 ture. Peculiar scales, with a certain resemblance to Creatochanes. 



Carnegiella strigata (Giinther). Small scales, formed essentially as in 

 Gasteropelecus, but the radii very weak and irregular, and sometimes 

 as many as nine, while the nuclear area is very broadly minutely 

 irregularly reticulated. 



Chalcinus rotiindatus (Schomburgk) (Plate XXVII, fig. 6). Quite 

 large scales (about eight mm. broad). The shape well shown in 



