178 Bulletin ^7, United States National Museum. 



28«. CATOSTOMUS OCCIDENTALIS, Ayres. 

 (Sacramento Sucker.) 



Body rather slender, little elevated. Mouth compaiativoly smiiii, 

 smaller than in C. commersonii ; the upper lip with 5 or 6 rows of smallish 

 papilla! ; lips rather thin. Head quite small, rounded above, 4^ in length, 

 the profile steeper than in C. commersonii ; the snout more pointed, the 

 two sides of the head more convergent forward. Eye small. Dorsal fin 

 longer than high, its rays 12 to 14 ; caudal well forked, the upper lobe the 

 longer. Scale 13-75-10, 40 before dorsal. Dark above, gradually paler 

 below. Streams of California ; abundant in the Sacramento and San 

 Joaquin rivers, (occidentalis, western.) 

 Catoshmus occidenlaUs, Ayre.s, Proc. Cal. Ac. Sci.,1854, 18, San Francisco ; Aoassiz, Am. Jour. 



Sci. Arts, 1855, 209, San Francisco ; Jobdan, I. c, 172, 1878 ; Gvntheb, Cat., vii, 17, 1868 ; 



Jordan & Gilbert, Synopsis, 128, 1883. 



287. CATOSTOMUS BERNARDINI, Giraid 



Closely allied to C. occidentalis, but with the head less conic and the 

 lower fins larger. Scales much crowded forward, 31 before dorsal, 75''in 

 lateral line; fontanelle large; lips broad, without sheath, formed as in 

 C. occidentalis, the lower deeply incised ; fins high, the dorsal longer than 

 high, with 12 rays ; caudal lobes equal ; head i^ in length. San Bernar- 

 dino Creek, a tributary of Rio Yaqui, on the boundary of Arizona and 

 Soiiora. 



CatosUmuts beniardini, Girard, Proc. Ac. Nat. Sci. Phila., 1856, 175, San Bernardino Creek; 

 Jordan & Gilbert, Synopsis, 128, 1883; Jordan, Cat., 18, 1885. (Type, No. 174.) 



288. CATOSTOMUS MACROCHEILUS, Girard. 

 (Columbia Eiver Sucker.) 



Head 4 in length, depth 5. Scales 12-72.to 75-10, 40 before dorsal. Body 

 heavy forward ; snout blunt, much overlapping the horizontal mouth; 

 mouth quite large, with very large lips, the upper full and pendant, with 

 6 to 8 rows of moderate papilla>. Head large, 4^ in length, rather narrow, 

 quadrangular, the snout projecting. Eye large, 6 in head. Dorsal fin 

 much longer than high, its rays about 15; pectorals long and narrow; 

 caudal well forked. Coloration rather dark; a dusky lateral stripe ; below 

 abruptly pale. Columbia River as far as Flathead Lake, Montana ; not 

 rare. {ixaKphg, large; x^'^^o^t lip-) 



Caloalomus ii> acrocheilna, GiRARD, Proc. Ac. Nat. Sci. Phila., 1856, 175, Astoria, Oregon : Jordan, 

 7. c, 171,1878; Jordan & Gilbert, Synopsis, 128,1883; Evermann, Bull. U.S. Fish Com., 

 1891, (1892), 40, plato 18, fig. 2. (Tyjic, No. 240.) 



289. CATOSTOMUS COMMERSONII, (Lacepede). 

 (Common Sucker; White Sucker; Brook Sucker; Fine-scaled Sucker.) 



Body moderately stout, varying with age, subterete, heavy at the 

 shoulders, the depth 4 to 4t in length. Head rather large and stout, 

 conical, flatfish above, its length 4 to 4i in body (3^ to 4i in young). Snout 

 moderately prominent, scarcely overpassing the mouth. Mouth rather 

 large ; the lips strongly papillose, the upper moderate, with 2 or 3 rows 



