286 



FISHES OF ILLINOIS 



lections coming from the former situation and 90 per cent, from the 

 latter. 



It is further reported from Ohio, Iowa, Kansas, and Missouri to 

 Kentucky, Arkansas, and Oklahoma. 



Consistently with the relatively large size of this species, larvae 

 and pupas of May-flies were found by us to predominate in its food, 

 including one of the largest larvae of this family (Hcxagcnia) in our 

 streams. Larvae of dragon-flies, a small percentage of Chironomus 

 larvae, and water-bugs (Corixa), were the other elements of its food. 



Females greatly distended with eggs were taken by us June 

 5, 1901. 



■\j ■' M| 4. 



Fir. 6S 



HADROPTERUS ASPRO (Cope & Jordan) 



(black-sided darter) 



Kirtland, 1839, Journ. Bost. Soc. Nat. Hist., 340 (Etheostoma biennioides). 



Cope & Jordan, 1877, Proc. Ac. Xat. Sci. Phila . 51 (Alvordius aspro — substitute 



for Etheostoma biennioides of Kirtland, the name biennioides being preoccu- 



pied m Diplesion). 

 J. & G., 501 (Alvordius); M. V., 127 (Etheostoma); B., I, 5'' (Percina); J. & E., I, 



1032; N., 35 (Etheostoma biennioides), I 39 (Alvordius maculatus); F., 65; 



L., 27. 



Length .^ to 4 inches; body elongate, fusiform, somewhat compressed, 

 less cylindrical than in Percina; one of the most graceful and elegant m 

 form and color of all the darters; depth 5.4 to 6.8 in length; greatest, 

 width of bodv about : j of its greatest depth; depth of caudal peduncle 

 2.5 to 3.3 in its length. Color of midsummer females and immature 

 males yellowish olive or straw, with dark Mutches and mottlings; back 

 with about 8 quadrate spots, between which, on upper portion of sides, 

 are dark, longitudinally disposed marblings; a row of 7 or 8 large dark 

 blotches along middle of side, mure or less confluent, and sometimes 

 forming a continuous moniliform band, their color dark bluish olive to 

 bluish Mack; belly grayish in front, darkened with smoky blue poste- 

 riorly; head dark olive, with a darker streak before eve, and one below 



