31. ' CYPRINIDiE LEPIDOMEDA. 251 



lOS.— RICHARDSONIIJS Giiard. 

 (Girard, Proe. Acad. Xat. !^ci. Phila. 18.jG, 201: type Ci/jjrinus haJteatus Rich.) 



Body oblong- or elevated, strongly compressed. Head rather small. 

 Mouth terminal, oblique, jaws normal ; no barbels. Teeth 2, 5-5, 2, 

 or 2, 5-4, 2, hooked, without grinding surface, the edges entire. Gill- 

 rakers very small. Belly compressed behind ventral fins, the s(;ales 

 passing over its edge. Back of tail not keeled. Scales rather small. 

 Lateral line continuous, decurved. Dorsal fin well behind the ventrals. 

 Anal basis elongate. American j closely related to the European genus 

 Alhurnus. (Dedicated to Sir John Kichardson.) 



421. R. balteiitMS (Rich.) Grd. 



Body strongly compressed and somewhat elevated. Head small, the 

 snout rather short and conical. Mouth terminal, oblique, the lower jaw 

 slightly projecting beyond the upper. Eye large, 3.J iu bead. Colora- 

 tion plain, the sides bright silvery, crimson in males in spring. Anal 

 and caudal large. Dorsal low, much behind ^'entrals. Base of anal 4^ 

 in length. Head 4J; depth 3^. D. 10; A. 17 or 18; Vert. 40; Lat. 1. 

 13-U2-G; teeth 2, 5-4, 2. Columbia Eiver and northward ; abundant. 



{CiujriiiuH {Abrami>i) halteatus Ricliardsou, Fauna Bor.-Amer. iii, ^01: liichanhoniuH 

 haltvatus (Jid. U. S. Pac. R. R. 8iirv. x, 278: Ahramis halteatus Giiiitlicr, vii, I'OO. ) 



422. R. R»teralis Grd. 



Body slenderer and less comi)ressed. Mouth moderate, terminal, ob- 

 lique, jaws equal. Anal basis 5^ in length. Blackish above; a dark 

 lateral band; the iutersi^ace and belly pale; crimson in males in sum- 

 mer. Head 4^; depth 3=|-4. D. 10; A. 14; scales 13-55-G; teeth 2, 

 .')-5, 2. Columbia River and streams about Puget Sound. 



( lUchardsonius lateralis (ird. Proe. Acad. Nat. Sci. Phila. 185(5, 202, and U. S. Pac. 

 R. R. Snrv. Fish. 279: Abramis lateralis Giinther, vii, 309.) 



10f>.— L£PIDOITI£:»A Cope. 



(Cope, Proe. Aincr. Phil. Soc. Phila. 1874, 131: typo Lepidomeda vittata Co\h\) 



Body elongate. Mouth' terminal, without barbels. Teeth 2,4-4, 2, 

 hooked, without gTinding surface. Scales small. Lateral line (com- 

 plete. Dorsal fin with a strong spine, composed of two, the posterior 

 recein'd into a longitudinal groove of the anterior. Inner border of the 

 ventral fins adherent to the body. Dorsal fin inserted behind the ven- 

 trals. Anal basis short. Size small. {Ai-idn-, scaly ; Meda.) 



