356 



SYNOPSIS OF THE CYPRINIDiE OF PENNSYLVANIA. 



Dorsal fin over ventrals ; anal, basis short ; teeth two-rowed, without masticatory surface, smooth ; scales normal ; 

 mouth oblique. PHOTOGENIS. 



Dorsal fin over or a little behind ventrals; anal, basis short; teeth two-rowed, with masticatory surface, and 

 sometimes slightly crcnatc ; exposed portion of scales much narrowed, hence elevated; mouth oblique. 



HYPSILEPIS. 



Dorsal fin over ventrals ; anal, basis short ; teeth one or two-rowed, with masticatory surface, smooth ; scales 

 large, normal ; mouth small, inferior. HYBOrsis. 



GROUP III. No barbels; pharyngeal teeth sharp, hooked ; alimentary canal shorter than body ; dorsal fin with 

 a strong elevated spine. 



Teeth 1, 4 — 4, 1; body scalclcss. MEDA. 



GROUP IV. No barbels; pharyngeal teeth 4-4 only, cultriform, i. e., with oblique masticatory surface, with no 

 hook. First (bony) dorsal ray adherent to first articulated; labia attenuated; intestinal canal four times length. 

 Labia without sheath; dorsal fin above ventrals; teeth one-rowed. jiybognatiius. 



Group V. No barbels; pharyngeal teeth one-rowed, 4-4, with masticatory surface, sometimes hooked; osseous 

 dorsal ray separated from first articulated, by membrane; intestinal canal between two and three times length of 

 head and body. 



Lateral line continuous; head broad; mouth small, subinferior. IIYBORIIYNOHUS. 



Lateral line incomplete; head short, elevated; mouth small, inferior. 



IMMUIMIAI/rc.S. 



Tribe IV. MESOCYSTI. 



No barbels; pharyngeal teeth usually 4-4 only, with oblique masticatory surface and no hook; first (osseous) 

 dorsal ray attached; labia with attenuated cartilaginous sheath; mouth inferior; alimentary canal six to nine times 

 length head and body. campostoma. 



Of the above, the species of Semotilus, Ceratichthys, Hypsilepis, Clinostomus, Campos- 

 toma, Hyborhynchus, and Pimcphales, develop in the male sex, during the breeding sea- 

 son, rows of spinous tubercles on the head ; while the body is adorned with bright tints 

 of red in Argyreus, Clinostomus, Chrosomus. 



The following is the distribution of the species with reference to our three great water 

 basins, so far as known : 



, Susquehanna. 

 Semotilus rholln im. 

 Semotilus corporalis. 

 Ceratichthys micropogon. 

 Ceratichthys biguttatus. 



Ohio. 



Semotilus corporalis. 



Delaware. 



Semotilus rhothcus. 

 Scmotilua corporalis. 



Ceratichthys biguttatus. 

 Ceratichthys dissimilis. 

 Argyreus atronasus. 



Stilbe americana. 



Hypsilepis coniutus. 



Argyreus atronasus. 

 Argyreus nasutus. 

 Stilbe americana. 

 Hypsilepis coniutus. 



Argyreus atronasus. 

 Argyreus nasutus. 

 Stilbe americana. 

 Hypsilepis coniutus. 



