284 FISHES OF ILLINOIS 



bb. Color pattern longitudinal, the sides marked with a median row of blotches 

 or a moniliform band, above which are longitudinally disposed marblings. 



d. Scales 8-10, 64-70, 9-11; cheeks scaled aspro. 



dd. Scales 6, 52-60, 6 ; cheeks naked ouachitae. 



aa. Gill-membranes united at isthmus in a broad curve, least distance from 



muzzle to free margin of gill-me:nbranes 1 ^ to H times that from muzzle to 

 back of orbit. 



e. Head very slender and snout long and pointed, IJ times eye; interorbital 



space riarrow, its width twice in snout; lateral blotches small and as a 



rule faint; a very small central caudal spot phoxocephalus. 



ee. Head and snout less slender, the latter equaling eye; interorbital space 

 broader, less than 1^- times in snout; sides with 8 or 9 large and distinct, 

 often more or less confluent, dark blotches; base of caudal with 3 dark 

 blotches, the central and lower spots usually more or less merged . . scleras. 



HADROPTERUS EVERMANNI Moenkhaus 



Moenkhaus, 1903, Bull. U. S. Fish. Comm., Vol. 22, 397-398. 



Length of single specimen in our collection 3 inches; body stoutish, 

 onlv moderately elongate, and very little compressed, the cylindrical 

 form suggesting Percina caprodes ; depth 5.17 in length ; greatest width 

 of body about f of its depth; caudal peduncle short and stout, its depth 

 2.35 in its length. Color (in preservative) light olive with numerous 

 blotches and marblings ; back with about 6 large and more or less quad- 

 rate dark blotches; sides with 13 or 14 blotches, some of them extending 

 upward and downward so as to form ill-defined bars, the dark markings 

 above blotches being of a general transverse rather than longitudinal 

 pattern (as in H . aspro) ; first dorsal with membranes dusky at base, 

 especially toward. back of fin; tips of last rays and membranes dusky; 

 soft dorsal and caudal faintly barred, other fins plain; head smoky olive, 

 a prominent dark vertical streak below eye. Head rather short, bluntly 

 conic, 4.08 in length; width of head 1 . 79 in its length ; interorbital space 

 flat, 5.76 in head; eye oblique, 3.58; nose 2.97; mouth moderate, the 

 maxillary scarcely reaching to orbit, cleft 3.17 in head, lower jaw in- 

 cluded; gill-membranes noticeably but not at all broadly connected at 

 isthmus, the distance from muzzle to angle about 1 . 1 times that to back 

 of orbit. Dorsal fin XIII, 14; spinous and soft portions scarcely sepa- 

 rated; height of first dorsal 1 . 7 in head, of second 1 . 6 (height of first 91 

 per cent, of second) ; caudal truncate; anal II, 12 ; pectorals 1 . 1 in head; 

 separation of ventrals slightly greater than their width at base. Scales 

 8, 69, 8 [12]*; no pores lacking; cheeks with about 6 rows of rather large 

 scales; opercles and nape fully scaled; breast naked; belly naked ante- 

 riorly, a median row of immature caducous plates behind. 



Our single specimen of this species was taken at Havana, Illinois, 

 in the summer of 1897. While presenting resemblances to both H. 

 aspro and P. caprodes, it may be readily distinguished from both by 

 its different color pattern. 



Described from Lake Tippecanoe, Indiana. 



♦Number in brackets is count to middle line of belly; first count is to front of anal. 



