i885.] PROCEEDINGS OF tTNITED StAtES NATIONAL MUSEUM. 127 



' Tbis is Leadscus gihbosus, Ayres, as stated in tbe Synopsis, p. 24(). Tbe name Leu- 

 cisctis gihbosus is, bowever, preoccupied by Storer, 1845. Tbe appropriate specific 

 name crassicauda sbonld tberefore be restored. 



2 It is probable that Tigoma squamata, Gill, and Squalius rhomaleus, Jordan & Gil- 

 bert, are botb based on specimens of Siboma atraria, Girard. 



3 The only tangible character by which I can separate the tyTpeof Ptychochilus rapax 

 from tbe ordinary Pt. oregonensis is tbis: the scales before the dorsal fin in rapax are 

 much smaller than in oregonensis, there being about 49 scales in the former and 42 in 

 the latter on tbe median line before the dorsal. 



••The specimen from Lake Superior described by me (Bull. U. S. Nat. Mus., X., 60, 

 1877) as Luxilus selene, is identical with the types of Hudsouius fluviatilis. 



5 The only character by which I can separate N. amarus from JV. hudsouius is the 

 number of tbe teeth, 1, 4-4, 0, or 1 in amarus ; 2, 4-4, 1 in hudsonius. All specimens 

 examined from Pennsylvania, New York, and the Great Lakes are hudsonius; those 

 from Virginia to Georgia seem to be amarus. I cannot distinguish from amarus either 

 the types of AlburnoiJS saludanus, Jordan & Brayton, or those of Hudsonius euryopa, 

 Bean Hybopsis storerianus, confounded with N. amarus by several writers, is a dif- 

 ferent fish, belonging to another genus ( = Ceratichthys lucens, Jordan). 



Indiana University, Ajml 23, 1885. 



