178 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



35. CATOSTOMUS RETKOPINNIS Jordan, sp. uov. 

 1878 Catostomus retropinnis JORDAN, Bull. Hayden's Geol. Surv. Terr. (ined.). 



This fine species combines the mouth of C. latipinnis with the form 

 and general characters of C. longirostris. The type is No. 21,197, col- 

 lected by Dr. Elliott Coues in Milk River, Montana. It is a male speci- 

 men 16f inches in length. A specimen previously examined from Platte 

 Valley was identified as probably the female of (7. latipinnis^ but the 

 discovery of this large male specimen forbids such a supposition. 



Specimens in Ilie United States National Museum. 



36. CATOSTOMUS LATIPINNIS Baird & Girard. 

 Great- finned Sucker. 



3 Catostomus latipinnis BAIRD & GIRARD, in Proc. Ac. Nat. Sc. Phila. vi, 388. 

 Acomus latipinnis GIRARD, Proc. Ac. Nat. Sc. Phila. 173, 1856. 

 Acomus latipinnis GIRARD, U. S. Mex. Bound. Surv. Ickth. 39, pi. xxiv, f. 1-6, 



1859. 



<Catostomus latipinnis GUNTHER, Cat. Fishes Brit. Mus. vii, 14, 1868. 

 Catostomus latipinnis COPE, Hay den's Geol. Surv. Wyoming, 1870, 434, 1872. 

 Catostomus latipinnis JORDAN & COPELAND, Check List, 156, 1876. 

 1856 Catostomus guzmaniensis GIRARD, Proc. Ac. Nat. Sc. Phila. 173. 



Acomus guzmaniensis GIRARD, U. S. Mex. Bound. Surv. Ichth. 39, pi. xxiii, f. 6-10, 



1859. 



Catostomus guzmaniensis GtiNTHER, Cat. Fishes Brit. Mus. vii, 15, 1868. 

 Catostomus guzmaniense COPE & YARROW, Wheekr's Expl. W. 100th Mer. v, ZooL 



679, 1876. 

 Catostomus guzmaniensis JORDAN & COPELAND, Check List, 156, 1876. 



HABITAT. Arizona and Sonora. Green Eiver, Wyoming (Cope}. Probably not 

 abundant. 



This species is one of the most strongly marked of our Suckers. The 

 male fish may be known at once by the slender form and excessive 

 development of the fins, and probably in the females the fins are more 

 developed than in the males of any of the related species. The squama- 



