31. CYPRINID^; LEPIDOMEDA. 251 



1O8. RBCHARDSONIUS Girard. 



(Girard, Proc. Acad. Nat. Sci. Phila. 1856, 201: type Cyprinus lalteatua Rich.) 



Body oblong 1 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 scales 

 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; closely related to the European genus 

 Alburnus. (Dedicated to Sir John Richardson.) 



421. R. balteattis (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, 3i in head. Colora- 

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

 and caudal large. Dorsal low, much behind ventrals. Base of anal 4 

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

 13-G2-6; teeth 2, 5-4, 2. Columbia River and northward; abundant. 



(Cyprinus (Abramis) balteatus Richardson, Fauna Bor.-Auier. iii, 1501 : Richardsonius 

 baltcatus Grd. U. S. Pac. R. R. (Surv. x, 278: Abratnis balteatus Giiuthcr, vii, 809.) 



422. R. lateralis Grd. 



Body slenderer and less compressed. Mouth moderate, terminal, ob- 

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

 lateral band; the interspace and belly pale; crimson in males in sum- 

 mer. Head 4J; depth 3f-4. D. 10; A. 14; scales 13-55-6; teeth 2, 

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



(RicJiardsonius lateralis Grd. Proc. Acad. Nat. Sci. Phila. 1856, 202, and U. S. Pac. 

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



109. LEPIDOMEDA Cope. 



(Cope, Proc. Amer. Phil. >Soc. Phila. 1874, 131: type Lepidomeda vittaia Cope.) 



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

 hooked, without grinding surface. Scales small. Lateral line com- 

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

 received 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. (^-fdoc, scaly ; Meda.) 



