..The fishes of Illinois . ries. It is commonest in northern Illinois and isleast frequently found in the southern part of the state. Like Per-cina caprodes, it has been taken by us most generally from the smallerrivers () and from creeks (1. 59), but only rarely from the largestrivers (. 4) or from lakes or sloughs (. 2). It is preeminently a speciesof swift water with a bottom of rock or sand, 94 per cent, of our col- 286 FISHES OF ILLINOIS lections coming from the former situation and 90 per cent, from thelatter. It is further reported from Ohio, Iowa, Kansas, and Missouri toKentucky, A
..The fishes of Illinois . ries. It is commonest in northern Illinois and isleast frequently found in the southern part of the state. Like Per-cina caprodes, it has been taken by us most generally from the smallerrivers () and from creeks (1. 59), but only rarely from the largestrivers (. 4) or from lakes or sloughs (. 2). It is preeminently a speciesof swift water with a bottom of rock or sand, 94 per cent, of our col- 286 FISHES OF ILLINOIS lections coming from the former situation and 90 per cent, from thelatter. It is further reported from Ohio, Iowa, Kansas, and Missouri toKentucky, Arkansas, and Oklahoma. Consistently with the relatively large size of this species, larva;and pupa? of May-flies were found by us to predominate in its food,including one of the largest larvas of this family (Hexagenia) in ourstreams. Larvae of dragon-flies, a small percentage of Chironomuslarvae, and water-bugs (Corixa), were the other elements of its food. Females greatly distended with eggs were taken by us June5, ages Fig. 63 HADROPTERUS ASPRO (Cope & Jordan)(black-sided darter) Kirtland, 1839, Journ. Bost. Soc. Nat. Hist., 340 (Etheostoma blennioides). Cope & Jordan, 1877, Proc. Ac. Nat. Sci. Phila., 51 (Alvordius aspro—substitutefor Etheostoma blennioides of Kirtland, the name blennioides being preoccu-pied in Diplcsion). J. & G., 501 (Alvordius); M. V., 127 (Etheostoma); B., I, 59 (Percina); J. & E., I,1032; N., 35 (Etheostoma blennioides); J. 39 (Alvordius maculatus); F., 65;L., 27. Length 3 to 4 inches; body elongate, fusiform, somewhat compressed,less cylindrical than in Percina; one of the most graceful and elegant inform and color of all the darters; depth to in length; greatestwidth of body about J of its greatest depth; depth of caudal to in its length. Color of midsummer females and immaturemales yellowish olive or straw, with dark blotches and mottlings; backwith about 8 quadrate spots, between which, on upper portion of sides,ar
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes
