20 



PROCEEDINGS OF THE NATIONAL MUSEUM. 



vol. 59. 



figure shows. In the Characidae the two sets have become entirely 

 distinct, as is shown in Acanthocharax microlepis (fig. 5) and in 

 Characilepis. In Bryconamericus (fig. 4) the condition resembles 

 that of the Characilepis scale in figure 2, except that the transverse 

 closely placed circuli have disappeared. In Charax gibbosus (fig. 6) 



\ \ 



Figs. 1-7.— Lateral line scale of Characilepis tripartitus new species; type. The enlarged 

 drawing shows the sculpture. 2, scale of characilepis tripartitus, new species. 3, scale 

 of Characilepis tripartitus, new species. 4, part of scale of Bryconamericus hyphessus 

 elgenmann. 5, part of scale of acanthocharax microlepis elgenmann. 6, details of sculp- 

 TURE in scale of Charax gibbosus (Linnaeus). 7, part of scale of Hyporhamphus unifasciatus 

 (Ranzani). 



there is a peculiar broken transverse sculpture along the line limiting 

 the widely spaced circuli, and near the nucleus this sometimes takes 

 the form of a network. It seems to be derived from the other set of 

 circuli. 

 Holotype and paratopes — €at. Nos. 9615, 9616, 9617, U.S.N.M. 



