(59) 
Genus LYTHRURUS, Jordan. 
104. Lytlirurus atripes Jordan, (sp. nov.) Compressed Red-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 Lythruri , 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— 11. 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. diplsemius , 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 2\ 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 ardent , are closely related, but may be readily distinguished 
when compared. Ardens is most elongate and looks somewhat like a No- 
tropis ; cyanocephalus , small and short, resembles Pimephales ; atripes has 
the smallest eye and the most compressed body. The coloration of the 
lower fins will probably always distinguish it. 
105. Lythrurus diplsemius (Rafinesque) Jordan. Red Fin. (M. Y. 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 2\ to 3 in, depth 4f in length, head 4$, eye 3£ in head, 
nose 3, D, 1-8, A, 1-10. Scales 8-48-4. Dorsal and anal 
fins marked as in atripes. Several specimens from Rock R., 
Ogle Co. S. A. F.] 
106. * Lythrurus cyanocephalus Copeland. Hoy’s Red Fish. (M. V. 
295 ; Nelson 47.) 
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. 
