812 PROCEEDINGS OF THE NATIONAL MUSEUM. vol. xxvi. 



The fins and lower parts of (ho ])0(ly in the spring males are often 

 charood with hriuht pio-nicnt, the prevailing- color of whieh is rt^d, 

 although in some genera it is satin-\Yhite, yellowisli, or hlack. 

 a Dorsal fin short, of 8 to 15 rays, usually without serrated spiiu"; no anal spine; air 

 bladder normally placed. 

 h RHonKix.E. Inte.'^tinal canal elongate, usually more than twice lenijth of l)ody; 

 teeth one-rowed, with grinding surface; lips thin; l)<>dy compressed; perito- 

 neum hlack; species herbivorous. 

 (■ Barbels none; Imdy deep, compressed; scales rather small, closely iml)ricated, 

 about 55 in lateral line; teeth 5—5, with serrate edges; anal fin ratiier 



long Pseudoperihiiiijiiis, 1. 



rr Barl)els present, at the end of each maxillary; scales large, of) to 40. 

 (1 P>ody rather deep, rhomboid, compressed. 



(' Teeth serrate; dorsal long, of about 15 rays f'<ir(tcliril(t<jn<(thit!<, 2. 



re Teeth with entire edges; dorsal moderate, of about 12 i-ays. 



AchellotjiKithus, 3. .|| 

 <I(J P>ody rather elongate, lanceolate in outline; dorsal short, of alxmt 10 rays; i 



teeth entire (iivitJiopiKjon, 4. 



bb intestinal canal short, less than twice length of body; teeth (jne, two, or three 

 rowed; peritoneum usually pale. Species more or less carnivorous. 

 / Teeth hooked, slender, none of them molar, the grinding surface, if I 

 present, very narrow, 

 gr Barbels present, well developed, one of them terminal on tlie maxil- 

 lary. 

 // B.vRBiN.E. Dorsal fin with its first developed ray thickenetl or spine- 

 like, 

 t Barbels two on each side; teeth three-rowed; Hjjs thick; head with 



mucous cavities Hemibarbn,^, 5. 



hh GoBioNiNiE. Dorsal fin without spine-like ray; scales large. 

 j Teeth 1, 2 or 3, 5—6 or 5, 3, 2 or 1, two-rowed. 



k Lips thin; mouth, terminal, oblique; dorsal nearly over ven- 



trals Leucogohio, 6. 



• kk Lips broad and papillose; mouth small, protracted down- 

 ward Psendocjohio, 7. . 



jj Teeth one-rowed, 5 — 5. 



/Mouth inferior; lips rather thick, ventrals Itehind front of I 

 dorsal. 

 m Dorsal tin low, its median rays not produced; head l 



rounded alwne Sdrrodifilichlhi/s, 8* 



mm. Dorsal fin high, its median rays produced in males; 



head flattened above AbhoUhia, 9. 



// Mouth terminal, oblique, the lower jaw projecting; head I' 



depressed and pointed Zezer<(, 1 0. 



(j(j Lei-ciscix.e. Barbels wanting. 



n Teeth one-rowed, 5-^5; a notch on should(>r giiilii' 

 below, inside gill opening; scales large. 

 Snout very blunt, rounded; mouth inferior. 7>//''/(f, 11. 

 00 Snout long; mouth small, terminal, nearly verti- 

 cal Psi'udorasbora, 12. 



mi Teeth tworowed; 2, 5 — 1, 5, or G, 2 or 1. 



J) Lateral line straight; teeth 2, 5—5, 2; mouth ter- 

 minal, very oblique; scales large, al)out 40. 



Okdia, 13. 

 })p Lateral line curved downward. 



