SYNOPSIS OF THE CYPEINIDJ! OF PENNSYLVANIA. 



355 



Tribe II. CCELOPHORI. 



Dorsal fin above vontrals; basis of anal short; teeth hooked, without masticatory surface, 1, 4 — 4, 0; mouth 

 subinferior, small; scales moderate; lips normal. ericymba. 



Tribe III. EITCYSTI. 



GROUP I. Maxilla with barbels; pharyngeal tooth hooked, without masticatory surface; bony dorsal ray at- 

 tached; alimentary canal shorter than to equal length of head and body (without caudal fin). 



a. Premaxillaries projectile; lip separated by a dermal fold. 



No terminal; two lateral maxillary barbels; teeth 2, 5 — 4, 2. semotieus. 



Two terminal, no lateral maxillary barbels; teeth 3, 5 — 5, 2. gobio. 



Two terminal, no lateral maxillary barbels ; teeth 2, 4 — 4, 2, or the front row 1-1 or 0-0. CERATlcrmiYS. 



aa. Premaxillaries not projectile; skin of lip and front continuous. 



Two terminal, no lateral maxillary barbels; teeth 2, 4 — 4, 2; isthmus wide. 



ARQYREUS. 



GROUP II. No barbels; pharyngeal bones hooked, with or without masticatory surface; first (osseous) dorsal ray 

 adherent. 



a. Teeth of inner pharyngeal series 5-4 or 5-5 (two-rowed). 



Dorsal fin above ventrals ; teeth inner row 5-5, no masticatory surface ; mouth terminal ; scales usual surface 

 cx P° sed - (SQUALIUS.) 



Dorsal fin above ventrals; teeth, inner row 5-4, without masticatory surface; mouth inferior; scales usual sur- 

 face exposed. (teeestes.) 



Dorsal fin markedly behind vontrals ; anal, basis elongate ; teeth, inner row 5-5 without masticatory surface ; 

 mouth superior; scales usual surface exposed. (albuenus.) 



Dorsal fin over space between ventrals and anal ; anal, basis elongate ; teeth one-rowed, with masticatory surface, 

 and crenato ; usual surface scales exposed ; mouth oblique ; alimentary canal elongate. stilbe. 



Dorsal fin behind ventrals; anal, basis short; teeth one-rowed, 5-5, 4-5, with masticatory surface ; mouth 

 straight or oblique; scales small, normal, lateral lino interrupted or wan ting; alimentary canal elongate. CIIROSOMUS. 



Dorsal fin behind ventrals; anal, basis short; teeth two-rowed, inner, 5-4, without masticatory surface; mouth 

 oblique ; scales minute, exposed as usual; lateral line interrupted or incomplete; alimentary canal short, piioxinus. 



Dorsal fin little behind ventrals; anal short; pharyngeal tooth two-rowed, without masticatory surface, inner 



series 5-4; mouth largo, oblique; scales usual surface exposed; lateral line complete. clinostomus. 



aa. Teeth of inner pharyngeal series 4-4 (often one-rowed). Alimentary canal not longer than head and body. 



Dorsal fin over space between ventrals and anal; anal basis sometimes elongate; teeth two-rowed not crenate 

 rarely with narrow masticatory surface; scales normal. aeburneleus. 



