220 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



lytical key to the species of the genus. If the upper lip is narrow, with 

 few rows of tubercles, it will not be easy to separate fecundus from teres. 

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

 to C. occidentalism differing, however, in the larger scales (about 60 in 

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

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

 future time : 



14 It is a true Catostomus having the parietal fontanelle well marked and widely open. 

 The head enters in entire length 5 times, the diameter of the orbit 6 times in greatest 

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

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

 sal. The width of the dorsal to ventral enters the 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 from the 

 insertion of the first dorsal to pectoral, and in 60 transverse rows from branchiae to 

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

 larger on ventral. Body elongated, subfusiform. It differs from C. (Acomus) r/eneroaus, 

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



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

 enters greatest length of side of head 5 times instead of 6. The anterior insertion of 

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

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

 ventrals in C.generosus originate under the posteiior third of the dorsal ; in C. fecundus 

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

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



"This species is abundant in Utah Lake, and is called 'Sucker* by the settlers. 

 They run well up the rivers to spawn in June ; feed on the bottom and eat spawn 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 

 in winter, at an average price of 2 cents a pound." (COPE & YARROW, I. c.) 



Specimens in United States National Museum. 



Number. 



Locality. 



Collector. 



12894 



Utah Lake. 

 . do.. 



Yarrow & Henshaw. 

 Do. 



