..The fishes of Illinois . ad, and a pro-jecting, prow-like lower jaw. It carries no flag, but is colored likethe rocks among which it lives. * * * The Fan-tailed Darterchooses the coldest and swiftest waters, and in these, as befits his-form, he leads an active, predatory life. He is the terror of water-snails and caddis-worms, and the larva; of mosquitoes. Six specimens were found by us to have made nearly two thirds,of their food from Chironomus larva;, about a fourth from smallMay-fly larva;, and the rest from copepod crustaceans. Females apparently nearly ready to spawn are in our collect
..The fishes of Illinois . ad, and a pro-jecting, prow-like lower jaw. It carries no flag, but is colored likethe rocks among which it lives. * * * The Fan-tailed Darterchooses the coldest and swiftest waters, and in these, as befits his-form, he leads an active, predatory life. He is the terror of water-snails and caddis-worms, and the larva; of mosquitoes. Six specimens were found by us to have made nearly two thirds,of their food from Chironomus larva;, about a fourth from smallMay-fly larva;, and the rest from copepod crustaceans. Females apparently nearly ready to spawn are in our collectionsObtained the last of May. BOLEICHTHYS 315 Genus BOLEICHTHYS Girard Darters separated doubtfully from Etheostoma, from which genusthey differ alone in the more noticeable upward flexure* of the lateralline anteriorly; premaxillaries non-protractile, as in Etheostoma, andcranium fl-shaped, as in that genus; vertebras (B. fusiformis) 36 (16+20) ;pyloric casca 4f. Species few and variable; size small; colors not Fig. 75 BOLEICHTHYS FUSIFORMIS (Girard) Girard, 1854, Proc. Bost. Soc. Nat. Hist., 41 (Boleosoma). J. & G., 519 (Poecilichthys barratti), 520 (P. fusiformis, P. erochrous and P. eos),521 (P. gracilis); M. V., 134 (Etheostoma); B., I, 75 (Etheostoma); J. & E., I,1101; N., 34 (exilis, eos, etc.); J., 42 (eos), 43 (elegans); F., 64 (Etheostoma eosand fusiforme); L., 29. Length 2 to 2\ inches; body moderately elongate, compressed, theback more or less elevated; depth 5 .8 to 7 .1 in length; greatest width ofbody about f its greatest depth; caudal peduncle rather slender, itsdepth 2 .9 to 3 .3 (3 . 8) in its length. Color (in preservative) olivaceous,much blotched and dotted with brown, the dark color often in more orless definite W- and X-shaped markings, though more often in vaguelydefined zigzag streaks and rusty splotches; a black band in front of eyeon snout and a dark blotch behind eye; suborbital streak faint; spinousfaintly dusky in membranes near base; s
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Keywords: ., bookcentury1900, bookdecade1900, bookidcu31924, booksubjectfishes
