EED-FIN. 



851 



eye, around the snout ; males tuberoulate in the spring ; head 4 ; depth 4J ; D.8; A. 8; 

 scales 6-38-3 ; teeth 2, 4-4, 2. Length, 3i inches. 



Habitat, Ohio Valley. 



Diagnosis.— '-This species resembles the preceding, but reaches a smaller 

 size, and has a smaller eye. Its coloration is duller. 



Habits. — This species is found in most of the tributaries of the Ohio, 

 but is not very abundant. It seems to frequent mostly the small streams 

 and brooks in company wiih Hyhorhynchus notatus and Ericymha buccata. 



Genus 34. LYTHRUEU3. Jordan. 



Lylhrurus, Joedan, Man. Vert , 1st Ed., 1876, 2T2. 



Type, Semotilus dipl(Bmius, Raf. 



Etymology, Inthron, blood ; oura, tail. 



Body somewhat elongate, strongly compressed ; month normal, oblique; no barbels; 

 teeth 2, 4-4, 2, with grinding snrface ; intestinal canal short; scales small, closely im- 

 bricated; lateral line continuous, decurved; fins large; dorsal well behind ventrals 

 (with a black spot at its base in front in all known species) ; anal fio long ; its rays ten 

 to twelve ; size small; breeding colors brilliant, the tins being deep red in the males 

 in spring. Four species are known in the Mississippi Valley. These are closely 

 related, and may perhaps all be varieties of L. diplwmius. Only L. diplomiiua has 

 as yet been noticed in Ohio, but L. cyanocephalns, Copeland, a small compact species 

 resembling a Pimephales may be looked for in Northwestern Ohio. L. ardeus, Cope, a 

 slender silvery species like a Minnilua may be found in Southern Ohio, and L. atripes, 

 Jordan, a species with the anal black-spotted like the dorsal, may occnr in the sluggish 

 streams tributary to the Ohio River. We have, however, no evidence that any of these 

 species have a claim to be noticei in this report. 



74. Lythrurds DiPLiEMius (Rafinesque) Cope. 



Red*fin. 



f Semolilus diplemitis, Rafinesque, Ich. Oh., 50. 



Sypsolepis dipUmius, Putnam, Bull. M. C. Z., 1863, 7. 



Sypsilepis diplmmia, Cope, Proc. Phila. Acad. Sci., 1864, 279 ; Cyp. Penn., 373 ; Proo. 



Phila., Acad, 1867, 16i.— Jordan, Ind. Geol. Sarv., 1674, 223. 

 Leuciacua diplemiua, Gunther, Cat. Fishes, vii, 250 (not of Kirtland). 

 Luxilua diplwmia, Jordan, Bull. Buff. Nat. Hist. Soc, 1876, 94. 

 Lythrurua diplwmiua, Jordan, Man. Vert., Ist Ed., 1876, 285 ; 2d Ed , 1878. 

 f? Butilua f ruber, Rafinesque, Ich. Oh., 52 (probably L. ardeus). 

 Butilua compresaui, Kirtland, Rept. Zool. Ohio, 169 (probably not of Raf ). 

 Leuciacua compreeeua, Kirtland, Best. Soc. Nat. Hist., iv, 306. — Storbr, Synopsis, 469 



(probably the female of this species). 

 Deacription. — Body elongate, compressed, little elevated ; the caudal peduncle notably 

 long ; head long, conic, rather pointed ; mouth large, moderately oblique, the premax- 

 illary on the level of the pnpil, the maxillary extending to opposite the eye ; lower jaw 

 somewhat projecting; eye moderate, about equal to the muzzle, 3^ in head; scales 

 closely imbricated, crowded anteriorly, the ante-dorsal scales about 30 ; dorsal fin high, 



