Pkoc. Biol. Soc. Wash., Vol. XXII, I'JO'J, 



Pl.vte III. 



Scales of American Cyprinid.e. 



1. Ericymba buccata. — Wild Cat Creek, Ind. Apical circuli flattened. 



2. Ptychocheilus grandis.—Cuche Cr., Calif. Apical circuli flattened, radii few. 



3. Opsopoeodus Osculus.— Houston, Texas. Apical circuli flattened, radii few. 



4. Semotilus corpnralis. — Norfolk, X. Y. Apical circuli angulate. 



5. Semotilus atromaculatus.—Vvoss Lake, Thoroughfare, Maiue. Apical circuli angu- 



late, radii many. 



