220 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



lytical kt'y to the species of tbe genus. If the upper lip is narrow, with 

 few r<nvK of tubercles, it will ijot be easy to separate /ec'MH<:/M8 from teres. 

 If the lip is broad, with many series of tubercles, it will be approximated 

 to C. occidentalism dittering, however, in the larger scales (about 00 in 

 the lateral line, instead of 72). I therefore quote the original descrip- 

 tion, and leave the relations of the species to be tinally settled at some 

 future time : — 



" It is a true Catostomua Laving the parietal fontauelle well marked aud widely opeu. 

 The head eurers in entire length 5 times, the diameter of the orhit 6 times in greatest 

 length of side of head. The insertion of the dorsal fiu anteriorly is nearer to tlic end 

 of the muzzle than insertion of caudal ; the ventrals originating below middle of dor- 

 sal. The width of the dorsal to ventral enters tbe entire length to insertion of caudal 

 6 times. 



" Radii : D. 12-13. A. 1-8. P. 7. V. 11. Scales are in 20 longitudinal rows fioni the 

 insertion of the first dorsiil to pectoral, acd in 60 transverse rows Iroui hranehiai to 

 insertion of caudal : they are elongate acd octagonal, smaller on dorsal region, and 

 larger on ventral. Body elongated, subfusiform. It dillers from C. {Acomus) (/rntrosua, 

 Gir., in many particulars, as may be seen from the following comparisons. 



" Girard's species has no fontanelle ; is shorter aud narrower; the diameter of orbit 

 enters greatest length of side of head 5 timts instead of S. The anterior insertion of 

 dorsal fin is equidistant between the end of the snout aud the insertion of the cauual, 

 while in C.fccundus, it is nearer the end of the snout than insertion of caudal. The 

 ventrals in CgencroHus originate under the posteiior third ofthe dorsal ; iu C.fccundua 

 under the middle third of the dorsal. The radii iu C. generosus are: D. 10, A 2,7, P. 

 IG, V. 10, C. 27 ; iu V.fecundua: D. 12-13, A. 1,8, P. 17, V. 11. 



"This species is abundant iu Utah Lake, and is called 'Sucker' by the eettlers. 

 They run well up the rivers to spawn iu June; feed ou the bottom and eat spaun of 

 better fish ; spawning beds on gravel ; bite at hook sometimes ; are extremely numer- 

 ous, and are considered a nuisance by the fishermen, but they meet with a ready sale 

 iu winter, at au average price of 2J cents a pouud." — (CoPK & Yai;i:ow, /. c.) 



SpecivKTis in rnilcd i^fatcx yatioiidl Miiyiuni. 



Number. I Locality. 



Collector. 



12^94 



Utiiih Laki 

 do.. 



Yarrow & Henshaw. 

 Do. 



