12 crTuiniujtt. 



First Group. CATOSTOMINA. 

 Phaiyngeal teeth in a single series, exceedingly numerous and 

 closely set. Dorsal fin elongate, opposite to ventrals ; anal short 

 or of moderate length. Barbels none. 



North America and North-eastern Asia. 



1. CATOSTOMUS*. 



Catostomus, sp., Lesueur, Journ. Ac. Nat. Sc. Philad. i. 1817, p. 88 ; 



Cuv. <^ Veil. xvii. p. 418. 

 , sp., et Rhytidostomus, sp., Heckelf in Ritssegger' s Reisen, i. 



p. 1022. 

 Ptjchostomus, Hylomyzon et Catostomus, Agassiz, in Amer. Journ, 



Sc. 8f Arts, xix. ] 855, pp. 88-92. 

 Minomus, Acomus, &c., Girard, Proc. Ac. Nat, Sc. Philad. 1856, p. 173. 



Scales of small, moderate, or large size. Lateral line present, 

 running along the middle of the tail. Dorsal fin of moderate ex- 

 tent, with not more than about seventeen rays, ojiposite to the ven- 

 trals, without spine. Anal fin very short but deep. Fins of the males 

 generally more produced than those of the females, and frequently 

 with homy tubercles. Mouth inferior, with the lips more or less 

 thickened and papillose, the lower frequently bilobed. Barbels 



* 1. Catostomus longirostrum, Lesueur, I. c. p. 102. — State of Vermont. — 

 Snout long; eyes large; scales very small. D. 12(?13). Five inches 

 long. 



2. oneida, Bekay, New York Fauna, Fish. p. 198. — Lake Oneida. — 



D. 15. Scales large. 



3. Ptychostomus albidiis, Girard, in U. Sf. 8f Mex. Bound. Survey, Ichthyol. 



p. 36, pi. 19. figs. 6-8. — Rio San Juan, New Leon. — Scales rather small. 



4. Catostomus insignis, Baird S( Girard, in Proc. Ac. Nat. Sc, Philad. 1854, 



p. 28; Minomus insignis, Girard, in U. St. cf- Mex. Bound. Survey, 

 Ichthyol. p. 37, pi. 21. figs. 1-4.— Eio San Pedro, Tributary of Eio 

 Gila.— D. 13. L. lat. 60. 



6. clarkii, Baird 8f Girard, in Proc. Ac. Nat. Sc. Philad. 1854, p. 27; 



Minomus clarkii, Girard, in U. St. Sf Mex. Bound. Survey, Ichthyol. 

 p. 38. pi. 22. figs. 5-8.— Rio Santa Cruz.— D. 13-14 (12 in figure). 

 L. lat. 68-70. 



6. (Acomus) generosus, Girard, in Proc. Ac. Nat. Sc. Philad. 1856, 



p. 174; or in U. St. Pac. B. R. Exped. Fish. p. 221.— Cottonwood 

 Creek, Utah. — Scales very small. 



7. (Acomus) lactarius, Girard, in Proc. Ac. Nat. Sc. Philad. 1856, 



p. 174 ; U. S. Pac. R. R. Exped. Fish, p. 223, pi. 60.— Upper Missouri. 



8. ■ sucklii, Girard, in Proc. Ac. Nat. Sc. Phil. 1856, p. 175 ; U. 8. Pac. 



R. R. Exped. Fish. p. 226, pi. 51.— Milk River, Upper Missouri.— 

 D. 14. Scales large. 



9. texanus, Abbott, Proc. Ac. Nat. Sc. Philad. 1860, p. 473.— Colorado 



and New Rivers. — D. 15. " Scales of medium .size." 



10. chloropteron, Abbott, I. c. — Kansas. — D. 13. 



11. Cyprinus rostratus. Tiles. Mem. Ac. Sc. St. Pctcrsb. iv. 1813, p. 454, 



tab. 15. figs. 1-2; or in Pallas, Zoogr. Ross.-As. iii. p. 307; Catostomus 

 tilesii, Cuv. ^- Val. xvii. p. 469. — Eastern Siberia. — Scales small ; snout 

 much produced, the eye being behind the middle of the length of the 

 head. Lower lip tJlDh«d- 



