Cockerell — Tlie Nomenclature of American Fishes. 217 



(3) Subgenus Clinostomus Girard. 



Richardsonius elongatus (Kirtland). Small, broad scales. 



(4) Subgenus Richardsonius s. str. 



Richardsonhis bnlfentus (Rich.) Girard. 

 Richardsonius thermopkilus Evermann & Cockerell. 



(o) Subgenus Cheonda Girard. 



Richardsonius egregius (Girard). 



Richardsonius hydrophlox (Cope). 



Richardsonius carletoni (Kendall). 



The.se three are not very closely related, and are placed here provi- 

 sionally, especially as I have not seen Richardsonius cooperi (Girard ) , 

 the type of Cheonda. 



(6) Subgenus Margariscus nov. 

 Type margarita. The so-called American Pho.rinus, but wholly diverse 



from true Phoxinus. A small-scaled group. 

 Rirhardsonins margarita (Cope). 

 Richardsonius neogicus (Cope). 



( 7 ) Subgenus Hemitremia Coi)e. 



Richardsonius vittatus (Cope); syn. Leuciscus flammeus (Jordan & 

 Gilbert). This I have not seen. 



loTiCHTiiYS Jordan & Evermann. 



lotichthys phlegethontis (Cope). Scales not seen. 



SiPH.vrELES Cope. (Rutilus subg. Leucos Auctt. Amer. ) 



Siphateles oUvaceus (Cope). Scales very small, with few radii. 



^Ivi,oi.ELcrs Cope. ( Rutilus Auctt. Amer. ) 



Myloleucus thalassinus Cope. 



Myloleucus symmeiricus (Baird &. Girard). A composite species. 



Myloleucus columbianus (Snyder). 



Myloleucus oregonensis (Snyder). 



Myloleucus bicolor (Girard). 



Myloleucus boucardi (Giinther). Not seen. 



The group Siboma Girard, I have not seen. 



