APRIL, 1910. FISHES OF CHICAGO MEEK AND HILDEBRAND. 277 



Genus Hybopsis Agassiz. 



Body elongate, robust; mouth terminal or inferior, one or more 

 barbels on posterior end of maxillary; premaxillary protractile; teeth 

 4-4 or i, 4-4, i or o, hooked and with grinding surface; alimentary 

 canal short; peritoneum pale dusky or black; scales 35 to 60 in lateral 

 series. All of the species of this genus inhabit clear running water. 



a. Mouth small, horizontal or nearly so; snout blunt; margin of 

 upper lip on or below level of lower margin of orbit; sides 

 silvery. 



b. Origin of dorsal fin about midway between base of caudal and 

 tip of snout; preorbital bone moderate; head 3.6 to 4.2 in 

 length of body. 



c. Scales moderate, 38 to 47 in lateral series; diameter of eye 

 3.1 to 3.8; back and sides with irregular dark blotches. 



dissiwiilis , 277 



cc. Scales larger, 35 to 38 in lateral series; diameter of eye 2.8 to 



3.1 ; sides silvery, without dark blotches. amblops, 278 



bb. Origin of dorsal fin much nearer tip of snout than base of caudal ; 



preorbital bone large, silvery; head 4.3 to 5.3 in the body. 



storerianus, 278 



aa. Mouth large, oblique; snout pointed; margin of upper lip about 

 midway between lower margin of eye and lower edge of cheek ; 

 sides little or not at all silvery. kentuckiensis , 279 



Hybopsis dissimilis (Kirtland). SPOTTED SHINER. 



Head 3.9 to 4.2; depth 4.7 to 5.3; D. 8; A. 7; scales 38 to'45. 



Body elongate, moderately compressed; head long, flattish above; 

 mouth small, horizontal, inferior, the tip of upper lip below level of 



FIG. 42. SPOTTED SHINER. 



Hybopsis dissimilis (Kirtland). (From Forbes and Richardson.) 



lower margin of eye; maxillary reaching anterior nostril, its length 

 3.6 to 4.3 in head ; maxillary barbel less than diameter of pupil ; snout 

 blunt, 2.4 to 2.7 in head; diameter of eye 3.1 to 3.8; teeth 4-4, with 

 narrow grinding surface; alimentary canal i to 1.5 times length of 



