31. CYPRINID^ LEPIDOMEDA. 
251 
108.— RICHARDSONIUS (iirard. 
(Girard, Proc. Acad. Nat. Sci. Pliila. 1856, 201: type Cyprinus halteatus Rich.) 
Body oblong or elevated, strongly compressed. Head rather small. 
Month 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 tins, the scales 
passing over its edge. Back of tail not keeled. Scales rather small. 
Lateral line continuous, decurved. Dorsal tin well behind the ventrals. 
Anal basis elongate. American; closely related to the European genus 
AUmrniis. (Dedicated to Sir John Kichardson.) 
421. R. balteatus (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 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 44; depth 3:|. D. 10; A. 17 or 18; \"ert. 40; Lat. 1. 
13-02-0; teeth 2, 5-4, 2. Columbia River and northward ; abundant. 
{Cyprinus (Ahramiti) halteatux Richardson, Fauna Bor.-Auier. iii, :’U1 : lliehardsoniuH 
hallcatus (trd. U. S. Pac. R. R. Surv. x, 278: Ahramis halteatiis Giinther, vii, 309.) 
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 4^; depth 3;‘|-4. D. 10; A. 14; scales 13-55-6; teeth 2, 
5-5, 2. Columbia River and streams about Puget Sound. 
{lUchardsonius lateralia Grd. Ih’oc. 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. Plnl. Soe. Phila. 1874, 131: type Lepidomeda vittata 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 siiine, composed of two, the posterior 
received iiito a longitudinal groove of the anterior. Inuer border of the 
ventral fins adherent to the body. Dorsal fin inserted behind the ven- 
trals. Anal basis short. Size small. {XiTzcdo-:^ scaly ; Meda.) 
