percopsid^e. 75 



Order: ACANTHOPTERI. 



Sub- Order : Salmoperc^E. 



Family: Percopsid.E. 



Genus : Percopsis. 



Percopsis guttatus Agassiz. Trout Perch. 



Head 3% to 4; depth 4 to <\%. D. II, 9; A. I, 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 Count} 7 , "abundant in Little Miami 

 river below the dam at Loveland," Henshall, 1888 ; Lorain 

 County, " common in Lake Erie, Black river and Beaver creek," 

 McCormick, 1S92 ; Franklin County, taken in most of the streams 

 •of the count)', 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: Aphredoderid^E. 



Genus : Aphredoderus. 



Aphredoderus sayanus (Gilliams). Pirate Perch. 



Head 3; depth 3. D. Ill, 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 



