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Genus LYTHRURUS, Jordan. 



104. Lythrurus atnjjes Jordan, (sp. nov.) Compressed Eed-fin. 

 Body moderately elongate, very strongly compressed and elevated, the 



greatest depth about 3* in length ; head comparatively pointed ; somewhat 

 depressed above, so that an angle is formed at the occiput : length of head 

 about 3| in that of body; mouth rather large, quite oblique, the maxillary 

 reaching about to the front of the eye ; the lower jaw slightly projecting be- 

 yond the upper ; eye small, smaller than in the other Lt/thruri, 4 in head, 

 rather shorter than the snout. 



Scales of the usual type in the genus, very closely imbricated, their ex- 

 posed surfaces notably higher than long, especially anteriorly. Lateral line 

 very strongly decurved : scales 8-44-3. Dorsal fin beginning about mid- 

 way between ventrals and anal, rather high anteriorly, its rays 1-7, anal 

 rays I-ll. Pectorals not quite reaching ventrals, the latter just to vent. 



Color in spirits dusky bluish or livid, much as in L. cyanocephalus; no 

 traces of the vertical bars sometimes noticed in L. diplsemuis, each scale 

 with many fine black punctulations. Coloration of fins peculiar, the usual 

 dusky spot at the base of the dorsal in front, this spot smaller than in the 

 other species, a black transverse bar across the upper part of the dorsal ; 

 anal similarly colored to the dorsal, the markings paler. In L. diplsemius 

 the anal fin is plain. Tips of ventrals dusky, belly and lower fins probably 

 crimson in males in the spring; male specimens profusely covered on head, 

 front of back, sides of body anteriorly, and on lower jaw with small white 

 tubercles as in the other species of the genus. 



Length of types 2i to 3 inches. Collected by Prof. Forbes in various 

 streams in Union and Johnson counties. 



The four species now known of this genus, atripes, cyanocephalus^ di- 

 plsemius and arden.<, are closely related, but may be readily distinguished 

 when compared. Ardens is most elongate and looks somewhat like a ^o- 

 tropis ; cyanocephalus, small and short, resembles Pimephales ; atnpes has 

 the smallest eye and the most compressed body. The coloration of the 

 lower fins will probably always distinguish it. 



105. Lythrurus diplxmius (Rafinesque) Jordan, Red Fin. (M. V. 295 ; 

 Nelson 47.) 



Abundant in the southern two-thirds of the state, especially in 

 tributaries of the Wabash and the Ohio. Mackinaw Cr., McLean 

 Co.; Normal ; Effingham ; Union Co ; Rock R., Ogle Co,; Peoria. 



[var, gracilis Forbes, 



Length 2i to 3 in, depth 4f in length, head 44, eye 33 in head, 

 nose 3, D, 1-8, A, I-IO, Scales 8-48-4. Dorsal and anal 

 fins marked as in atripes. Several specimens from Rock R., 

 Ogle Co. S. A. F.] 



106. *Lythrurus cijanocephalus Copeland, Hoy's Red Fish, (M. V. 

 295; Nelson 4t,) 



Professor Copeland's types were from Root River at Racine. 

 Others have been taken in tributaries of Rock R. near Beloit, 

 within a few miles of the state line. 



