PERCOPSIDAS. a5 
Order: ACANTHOPTERI. 
Sub-Order : SALMOPERCAi. 
Family: PERCOPSIDA. 
Genus: PERCOPSIS. 
Percopsis guttatus Agassiz. TROUT PERCH. 
Head 3% to4; depth 4to4%. D.II,9; A. 1,7; scales about 50, strongly 
ctenoid. Head rather long, slender and conical, mouth subinferior. Body 
rather slender; caudal peduncle long and slender. A small but distinct 
adipose fin behind dorsal. Color, pale olivaceous on back, colorless and 
somewhat translucent below; about 11 small, dark spots along lateral line, 
and another row of smaller dots between this and mid-dorsal line. Length 
4 to 6 inches. 
Jordan and Evermann (Bull. 47, U.S. Natl. Mus.) in dis- 
cussing the range of this species give it as ‘‘ rare in streams south 
of Lake Erie.’’ ‘This statement does not seem to hold good for 
the State of Ohio, for in suitable localities the species is common 
as far as the southern limits of the state, and in some places is 
very abundant. Hamilton County, ‘‘ abundant in Little Miami 
river below the dam at Loveland,’’ Henshall, 1888; Lorain 
County, ‘‘ common in Lake Erie, Black river and Beaver creek,’’ 
McCormick, 1892 ; Franklin County, taken in most of the streams 
of the county, abundant in streams west of the Scioto, after 
some hauls in Scioto Big Run the seine contained more of this 
than all the other species combined, Williamson and Osburn, 
1897 ; John’s creek at Waterloo, Huron river at Milan, common 
at both places, R. C. Osburn, 1899 ; Ohio river at Bellaire, R. C. 
Osburn, 1900. 
Sub-Order: XENARCHI. 
Family: APHREDODERIDA. 
Genus: APHREDODERUS. 
Aphredoderus sayanus (Gilliams). PIRATE PERCH. 
Head 3; depth 3. D. III, 11 to IV, 10; A. II, 6; scales 45 to 60. Body 
oblong, elevated at base of dorsal, compressed behind. Head thick, de- 
pressed; mouth moderate, lower jaw projecting. Lateral line imperfect or 
wanting. The position of the anus is peculiar, being always anterior; it 
