96 UNIVERSITY OF COLORADO STUDIES 



short, about 1.75 in the head; ventrals almost as long as the pectorals; anal long, 

 but shorter than the dorsal; length of the base of the anal i . 3 to i . 5 in the length 

 of the base of the dorsal; anal spines VI, rays 10 or 11; scales ctenoid, 6 to 8, 

 38-45, II or 12. 



General color olivaceous, body above the lateral line irregularly mottled with 

 dark green; central portions of most of the scales with dark green or dusky spots 

 which collectively form interrupted longitudinal stripes coincident with the scale 

 rows; top of the head dark green; eye deep crimson; fins greenish, more or less 

 speckled. Size moderately large, reaching 12 inches, weight up to about 2 pounds. 



The Rock Bass ranges from Vermont south into Louisiana and west through 

 the Great Lakes region into the Des Moines and Kansas rivers. The first pub- 

 lished record found concerning the introduction of this species into Colorado shows 

 that one hundred adults and yearlings were sent to Colorado by the United States 

 Fish Commission in 1895.' 



Genus CHAENOBRYTTUS Gill 

 The Warmouth Bass 

 Chaenohryttus Gill, Amer. Journ. Set. Arts, p. 92, 1864. 



Much the same as Ambloplites; tongue with teeth; operculum not emarginate 

 but broadly rounded posteriorly; anal spines III. This genus includes the single 

 species, C. gulosus (Cuvier and Valenciennes). 



Chaenobryttus gulosus (Cuvier and Valenciennes) 

 Warmouth or Warmouth Bass 



Pomatis gulosus Cuvier and Valenciennes, Hist. Nat. Poiss., Vol. Ill, p. 498, 1829 (Lake 

 Pontchartrain). 



Body somewhat elongate, moderately compressed ; depth 2 to 2.5 in the 

 length to the base of the caudal fin; greatest width of the body about 2.3 in the 

 greatest depth; head large, 2. 25 to 2. 75 in the length; eye large, its diameter 4 

 to 4. 75 in the length of the head; angle of the mouth when closed reaching to the 

 level of the center of the eye; dorsal fin long, of X or XI spines and 9 to 11 rays; 

 anal short, length of its base 2 or a little more in the length of the base of the dorsal 

 of III spines and 8 to 10 rays; scales feebly ctenoid, 6 or 7, 38-45, 11 or 12. 



General color olivaceous with a slightly brassy luster, sides mottled or indis- 

 tinctly barred with bluish or dusky; ventral parts yellowish or greenish; four or 

 five bluish or reddish streaks radiating from the posterior margin of the eye 

 across the operculum; top of the head dusky gray; eye crimson to purplish; fins 

 grayish to oUvaceous, more or less irregularly speckled. Length 6 to 10 inches. 



The Warmouth Bass ranges from the Great Lakes south through the 

 Mississippi Valley into Texas and Florida, inhabiting ponds with mud bottoms 



' Repi. U.S. Com. Fisheries for i8gs-g6, p. 73, 1897. 



