RED-FIN. 851 
eye, around the snout ; males tuberculate in the spring; head 4; depth 44; D.8; A.8; 
scales 6-38-3; teeth 2, 4-4, 2%. Length, 3t HG AGE 
Habitat, Ohio Valley. 
Diagnosis.—This species resembles Tha preceding, but Peneber 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 Hyborhynchus notatus and Ericymba buceata. 
Genus 34. LYTHRURUS. Jordan. 
Lythrurus, J ORDAN, Man. Vert., Ist Ed., 1876, 272. 
Type, Semotilus diplemius, Raf. ; 
Etymology, luthron, blood ; ouvra, tail. 
Body somewhat elongate, strongly compressed ; mouth normal, oblique; no barbels; 
teeth 2, 4-4, 2, with grinding surface ; intestinal eanal short; scales small, clesely 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 fin long; its rays ten 
to twelve ; size small; breeding cclors brilliant, the fins 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. diplemius. Only L. diplemius has 
as yet been noticed in Ohio, but ZL. cyanocephalus, Copeland, a small eosmpact species 
resembling a Pimephales may be looked for in Northwestern Ohio. JL. ardeus, Cope, a 
slender silvery species like a Minnilus may be found in Southern Ohio, and L. atripes, 
Jordan, a species with the anal black-spetted like the dorsal, may eceur in the sluggish 
streams tributary to the Ohio River. We have, however, no evidence that any ef these 
species have a claim to be noticed in this report. 
74. LytHRurus DIPL £MIUS (R.. finesque) Cope. 
Redefin.: 
? Semotitus diplemius, RAFINESQUE, Ich. Oh., 50. 
Hypsolepis diplemius, PUTNAM, Bull. M. C. Z., 1863, 7. 
Hypsilepis diplemia, Cope, Proc. Phila. Acad. Sci., 1864, 279; Cyp. Penn., 373; Proce. 
Phila., Acad., 1867, 162.—J@RDAN, Ind. Geol. Surv., 1874, 223. ! 
Keuciscus diplemius, GUNTHER, Cat. Fishes, vii, 250 (not of Kirtland). 
Luxilus diplemia, JORDAN, Ball. Buff. Nat. Hist. Soc., 1876, 94. 
Lythruras diplemius, JORDAN, Man. Vert., Ist Ed., 1676, 285; 2d Ed., 1878. 
% Rutitus ? ruber, RAFINESQUE, Ieh. Oh., 52 (probably L. ardeus). 
Kutilus compressus, KIRTLAND, Rept. Zool. Ohio, 169 (probably not of Raf ). 
Leuciscus compressus, KIRTLAND, Bost. Soc. Nat. Hist., iv, 306.—StTorer, Synopsis, 469 
(probably the female of this species). , 
Desoription.—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 pupil, the maxillary extending to opposite the eye; lower jaw 
somewhat projecting; eye moderate, abeut equal to the muzzle, 34 in head; scales 
elosely imbricated, crowded anteriorly, the ante-dorsal seales about 30; dorsal fin high, 
