178 CONTRIBUTIONS TO NORTH AMERICAN ICHTHYOLOGY III. 



35. CATOSTOMUS EETROPINNIS Jordan, sp. nov. 



1878 — Caiostomus retropinnis Jordan, Bull. Hayden's Geol. Surv. Terr. (incd.). 



This liue species combines tbe mouth of C. latipinnis with the form 

 and general characters of C. lougirostris. The type is No. 21,107, 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 C. latipinnis, but the 

 discovery of this large male specimen forbids such a supposition. 



Speci7nens in ilie United States National Museum. 



Number. 



f20933 

 21197 



Locality. 



Collector. 



Platte Valley 



Milk Eiver, Montaua (type) Dr. Elliott Coues. 



36. CATOSTOMUS LATIPINNIS Baird & Girard. 



Great-finned Sucker. 



1853 — Catostomus latijiinnis Baiud & Girard, iu Proc. Ac. Nat. Sc. Pbila. vi, 338. 

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

 Acomus latipinnis Girard, U. S. Mes. Bound. Surv. Ichtli. 39, \}\. xsiv, f. 1-6, 



1859. 

 Catostomus latipinnis GDnther, Cat. Fishes Brit. Mus. vii, 14, 1868. 

 Catostomus latipinnis Cope, Haydeu'a Geol. Surv. Wyoming, 1870, 434, 1872. 

 Catostomus latipinnis Jordan & Copeland, Check List, 156, 1876. 

 1856 — Catostomus guzmanicnsis 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 GtJNTHER, Cat. Fishes Brit. Mus. vii, 15, 1868. 

 Catostomus guzmaniense Cope Si. Y'arrow, Wheeltr's Exi)l. W. 100th Mer. v, Zool. 



679, 1876. 

 Catostomus guzmaniensis Jordan Sl Copeland, Check List, 156, 1876. 



Habitat. — Arizona and Souora. Green River, 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- 



