154 Proceedings of the Biological Society of Washington. 



25. Submarginal ctenoid elements like the marginal ; ctenoid patch very 



large ; basal margin very strongly crenate, the lobules free from 

 circuli (Cichlidse) . . JEguidens casruleopunclatus Kner&Steind. 



(Rio Las Sabanas, A. H. Jennings.) 



Satanoperca crassilabris Steind. (Frijoles, Canal Zone.) 



Submarginal ctenoid elements unlike the marginal ... ... 26 



26. Submarginal ctenoid elements long, strongly ridged ; basal margin 



not crenulate (Sciaenidse) . . . Paralonchurus dumerili Bocourt. 



(Panama, C. H. Gilbert.) 

 Submarginal ctenoid elements short 27. 



27. Basal margin not crenulate (Scisenidae) 



Odontoscion dentex C. & V. (Toro Point.) 

 Stellifer colonensis ( Mindi Reef. ) 

 Basal margin crenulate (Hsemulidpe) 



Orthoslcechus maculicauda GiW. (Tabogal.) 



Pomadasis bayanus Jord. & Everm. (Corazal.) 



Pomadasis macracanthus Gthr. (Balboa.) 



Orthopristis chalceus Gthr. (Balboa.) 



CHARACID^. 



An account of the scales of the neotropical Characidfe was published in 

 Annals Carnegie Museum, ix, 1914. AVhile recording the Panama species, 

 I give some notes on others, supplementary to the paper mentioned. 

 BiviBRANCHiix.E. BivibrancMa protractila Eigenmann. Rockstone, 

 British Guiana (Eigenmann). U. S. N. M. A remarkable fish, re- 

 sembling Albula vulpes. 



Scales about 2 mm. long and over 2.5 wide, broadly rounded apically, 

 sides sloping, base very broadly truncate, laterobasal angles distinct, 

 basal margin with a strong median lobe, nucleus central; circuli 

 coarse, absent from apical field. No radii, but a radial fold on each 

 side of basal lobe. The scale resembles that of the Curimatinse, but 

 is peculiar for the single basal lobe, and the thin weak apical field, 

 without radii or marginal teeth. 

 ANOSTOMATiN^. ScMzodonf asciatus Spix. BoHvia( Gibbon). U. S. N. M. 

 Large red scales, subquadrate, about 9.5 mm. long and broad, basal 

 margin strongly bilobed, circuli very fine and dense, nucleus approxi- 

 mately central; apical radii few and weak, except one on each side, 

 basal radii rudimentary ; apical field coarsely pustular. The Anostom- 

 atine genera known to me are separable thus : 



Scales with a strong radial line extending horizontally to each side, 

 and two (rarely one) extending upward to apex, in lateral line scales 



sometimes two also to base Anostomus. 



Scales without such radial pattern ; apical field with weak radii, usually 



rather numerous 1. 



1. Nucleus well below middle Leporinus. 



Nucleiis about middle Schizodon. 



BRYCONiN^. Brycon dentex Gthr. Nicaragua (L. F. H. Birt. ). U. S. 

 N. M. Scales about 11 mm. long and 13 broad. The three before me 



