PERCIDA. 49 
Opercle with a sharp flat spine, usually a smaller one below it and an 
obscure one above; sometimes two or three smaller ones below, often 
none; the position and number of these spines extremely variable. 
Cheeks usually closely scaled, the hinder third or less sometimes naked. 
Median furrow on top of head closely scaled. 
Coloration paler and more translucent, the shades less blended than 
in the Stizostethia ; olive-gray above, sides considerably brassy or pale 
orange, with much black mottling, the black gathered into several defi- 
nite dark areas, the most distinct of these being opposite the second 
dorsal; two others fainter, at each extremity of the spinous dorsal and 
one at base of caudal. These blotches are irregular and diffuse, but very 
characteristic. Young specimens are pale orange, with broad black 
shades. 
Spinous dorsal with two or three rows of round black spots, one of 
each row on the membrane between each pair of spines; no distinct 
blotch on posterior part of the fin; adarge black blotch at base of pec- 
torals. Second dorsal with about three rows of irregular dark spots ; 
caudal yellowish and dusky, a'most barred. Fin-rays:—dorsal XII—1, 17, 
varying to XITI—1, 18; anal II, 12. Lateral line with 92 to 98 se: les. 
Pylorie ceca 4 to 7; four of them larger than the rest, of different 
lengths, all small and shorter than the stomach. The usual number is 
six, but the two smnall ones are sometimes one or both absent, sometimes 
duplicated. Length of adult 10 to 15 inches. : 
Habitat.—Great Lake Region, and Upper Mississippi Rivers, also in 
the Ohio, where it has been introduced from the lakes, through the 
canals, according to the fishermen, 
The different form and coloration, particularly the markings of tie 
dorsal fin, distinguish this species at once from the Stizostethia. This 
species has, moreover, always fewer dorsal rays, more scaly cheeks, 21d 
a different armature of the operculum. 
The following is a catalogue of the known species of Stizostethium, 
with references to Dr. Giinther’s Catalogue of the Fishes in the Bri'ish 
Museum, vol. i:— 
1. STIZOSTETHIUM (CYNOPERCA) CANADENSE, (Smith) Jordan. 
Lucioperca canadensis, Giinther, i, p. 75. 
Lucioperca grisea, Giinther, i, p. 76. — 
Lucioperca (borea), Giinther, i, p. 501 (d. s.). 
2. STIZOSTETHIUM (STIZOSTETHIUM) VITREUM, (Mitchill) Jordan & 
Copeland. 
Lucioperca americana, Giinther, i, p. 74. 
Bull. N. M. No. 10—4 
