324 Field Museum of Natural History — Zoology, Vol. VII. 



slightly separate; separation of ventrals less than their width at 

 base; gill membranes connected to the isthmus; cheeks naked or 

 with few more or less embedded scales; opercles and nape scaled; 

 breast naked; ventral surface with ordinary scales; lateral line 

 nearly straight, completed or nearly so. 



Fig. 69. Green-sided Darter. 



Diplesion blennioides Rat". (After Forbes and Richardson.) 



Color olive-green, sides with orange dots and with 5 to 8 double 

 dark-green vertical bars, each pair forming a V-shaped figure, these 

 sometimes united forming a wavy lateral band ; spinous dorsal orange 

 brown at base, blue above; soft dorsal and anal fins blue-green with 

 some reddish; caudal greenish, faintly barred. 



Length 3 inches. 



This species ranges from South Dakota to Lake Ontario, Alabama, 

 and Missouri. 



Genus Boleosoina DeKay. 



Johnny Darters. 



Body elongate, subcylindrical ; mouth sinall, its gape horizontal; 

 premaxillaries protractile; teeth on vomer; ventral surface covered 

 with ordinary scales; gill membranes narrowly connected; pyloric 

 caeca 3 to 6. 



a. Lateral line complete or nearly so; cheeks and breast usually 



without scales ; p^doric coeca 6. nigrum, 324 



aa. Lateral line absent on posterior half of body; cheeks and 



breast usually closely scaled; pyloric coeca 3. camurum, 325 



Boleosoma nigrum (Rafinesque) . Johnny Darter. 



Head 3.5 to 4.2; depth 4.7 to 6.9; D. viii to x — 10 to 12; A. i, 

 6 to 9; scales 45 to 52. 



Body elongate, slender, subfusiform; head short with decurved 

 snout; interorbital space narrow, concave; inouth small, its gape 



