2792 Bulletin tf, United States National Museum. 



Page 176. After Catostomus catostomus add : 



282(a). CATOSTOMUS RIMICULUS, Gilbert <fc Snytler. 



Head 4& in body; depth 5; depth of caudal peduncle 2f in head; eye 7; 

 dorsal rays 11 ; scales 18-91-13, before dorsal 42. D. 11 ; A. 7; pectoral 17. 

 Head as deep as wide. Both lips full, the lobe of lower lip broadly 

 rounded behind, the cleft not nearly reaching base of lip, the portion 

 between mandible and apex of cleft with 4 series of tubercles; tuber- 

 cles coarse and blunt, becoming reduced in size toward margins of lips, 

 but less so than in related species ; upper lip with 5 rows of tubercles. 

 Eyes very small, the front of the eye nearly midway of head; interorbital 

 space convex, 2f in head. Scales comparatively smooth, gradually grow- 

 ing smaller posteriorly. Dorsal fin inserted midway between end of snout 

 and base of caudal, first ray preceded by 2 short, simple ones; last ray 

 divided to base; length of base of fin equal to the height, which is con- 

 tained 6 times in the body ; height of anal twice the length of the base, 

 5 in body; length of pectorals 4| in body; ventra-ls 6 in body; caudal 4. 

 Color above dusky, the central parts of scales lighter; under parts white; 

 dorsal and caudal fins dusky, others white. This species belongs to the 

 C. catostomus type, with very small scales, and is most nearly related to 

 C. tahoensis. From the latter it differs in the smaller eye, less deeply cleft 

 lower lip, blunter labial tubercles, larger scales, and the much smaller 

 fontanel, which is reduced in adults to a very narrow linear slit, or more 

 commonly entirely obsolete. Lower portion of the Klamath River basin, 

 northern California. (Diminutive of rimus, crevice, from the small fou- 

 tanel.) 



Catostomus rimiculus, GILBERT & SNYDER, Bull. TJ. S. Fish Comm. 1897 (Jan. C, 1898), 3, 

 Trinity River, Humboldt County, California. (Type, No. 5654, L. S. Jr. Univ, 

 Mus. Coll. Capt. "W. E. Dougherty.) 



Page 177. Catostomus rex is identical with Dcltistes Juxatas and should 

 be added to the synonymy of that species, p. 183. 



The type of Catostomus labiatus did not come from Klamath Lake, but 

 from the Sacramento River, at Stockton, California. It is identical with 

 C. Occident alls. The species from Klamath Lake has been recently 

 described as 



285. CATOSTOMUS SNYDEBI, Gilbert. 



Head 4 in length ; snout 2^ in head, equaling iuterorbital width ; eye 

 5|. D. 11; A. 7; scales 13 or 14-69 to 77-10 or 11. Mouth very small, the 

 width between angles but $ length of snout in our largest specimen; 

 greatest width of lobe of lower lip f- diameter of eye; lower lip deeply 

 incised, with 1 or 2 papilhe between symphysis and base of cleft ; upper 

 lip narrow, with 5 or 6 papilla? in a cross series, the uppermost becoming 

 very small ; basal portion of the lower lip with coarse tubercles, those 

 toward posterior margin becoming very fine and arranged in evident 

 series separated by grooves. Mucous canals on head forming conspicuous 

 raised ridges with prominent pores, the system much more conspicuously 

 developed than in any related species. Origin of dorsal fin constantly 



