30. CATOSTOMIDiE CATOSTOMUS, 127 



Alaska; very abundant northward. The most widely distributed 



species. 



{C/jprhius catostomus Forster, Phil, Trans. 1773, 155: Catostomiis long'irostrum and 

 Jiuihonius Le Sueur, Jouru. Acad. Nat. Sci. Pliila. 1817, 102, 107 : Catostomus forNtcrianun 

 Riclianlsoii, Frunkliu's Journal, 1823, 720 : Catostomus aurora Aj^assiz, Lake Superior, 

 3G0 : Calostomun hudsoiiius GUuther, vii, 13 : Catostomus griseus Guutlier, vii, 14 ; Jordan, 

 I.e. 175.) 



133. C taSloensss Gill & Jordan. — Tahoe Sucker. 



liather stouter, the depth 4^5 in length. Head very large and long- 

 aeuiuiuate, the muzzle nearly one-half its length, overhanging the rather 

 large mouth. Lips moderate, the upper pendent, with about 3 rows of 

 small pai)ilhe ; the lower rather full, similarly papillose. Eye nearly 

 median, rather small, 8i in head. Scales small and crowded forwards, 

 closely imbricated, 85-90 in the course of the lateral line, and about 

 28 in a cross-series from dorsal to ventrals. Dorsal short, but longer 

 than high, its rays 10. Coloration very dark; fins dusky; scales every- 

 where finely punctate. Breeding males profusely tuberculate. Size 

 large. Lake Tahoe ; very abundant. 



(Jordan, 1. c. 173 ; Jordan & Henslla^Y, Rept. Chief Engin. app. nn, 1878, 188.) 



•* Seales small, crowded, and smaller anteriorly than posteriori}^, 58-75 in the course 

 of the lateral line. (Dccactylus Rafinesque.*) 

 c. Ui)per lip thick and full, with several (5-8) rows of papilla?. 



d. Fontanelle very small and narrow ; both jaws with a weak cartilaginous 

 sheath. 



134. C araiopiis Jordau. 



Body elongate, fusiform, subterete, the greatest depth 4|-4J in 

 length. Ilead small, conical, 4g in length. Mouth quite large, with 

 full, thick lips, the upper very wide and pendent, with about G rows of 

 very strong papilliE ; lower lip two-lobed, similarly X)fipillose. Inter- 

 orbital space wide, convex. Eye elevated, posterior, quite small. Fins 

 moderate; dorsal higher than long, with 10, rarely 11, rays; ventral 

 rays 10. Scales small, crowded forwards, 10 or 9-70-8. Color dark ; 

 scales with dark i)unctulations. Nevada and Southern California. 



(Jordan, 1. c. 17:5; Jordan & Ilensliaw, Rept. Chief Engin. app. h«, 1878, 188.) 



dd. Fontanelle well developed ; lips without evident cartilaginous sheath. 

 e. Lateral line with 70-80 -scales. 



135. C. lal>iatus A^tcs. 



Head 4^ in length, rather bluntish. Mouth moderate, the labial pa- 

 pillae largely developed ; the upper lip full, with about 5 rows of large 



* Rafinesque, Ichth. Oh. 1820, GO : type Catostomus hostouicnsis Lc Sueur. ((5c«a, ten; 

 daKTvXog, toes; i. e., 10 ventral rays.) 



