. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 127 B, and E short, tapering evenly to pointed apex, fig. 469 contorta, p. 131 Sclerite A much narrower, D removed at least its own length from spiral of B, E long, obliquely truncate at apex and much closer to apex of F, fig. 470 anisca, p. 131 8. Claspers with a row of 4 or 5 long, stout, evenly spaced, black spines at middle shoulder, fig. 473 9 Claspers with black spines irregular or clustered at middle shoulder, figs. 475-477 10 9. Hook of tenth tergite large and reach- ing beyond sclerite B\ sclerit
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 127 B, and E short, tapering evenly to pointed apex, fig. 469 contorta, p. 131 Sclerite A much narrower, D removed at least its own length from spiral of B, E long, obliquely truncate at apex and much closer to apex of F, fig. 470 anisca, p. 131 8. Claspers with a row of 4 or 5 long, stout, evenly spaced, black spines at middle shoulder, fig. 473 9 Claspers with black spines irregular or clustered at middle shoulder, figs. 475-477 10 9. Hook of tenth tergite large and reach- ing beyond sclerite B\ sclerites C and D both slender, fig. 473. . .riesi, p. 132 Hook of tenth tergite small, sclerite B extending considerably beyond it; sclerite C very slender, sclerite D shorter and stout, fig. 474 confusa, p. 133 10. Right clasper with middle of ventral portion angulate; the angle bears a spine well separated from the others, fig. 475 spinosa, p. 132 Right clasper with middle of ventral portion evenly sinuate, fig. 476. . 11 11. Apex of claspers with a row of 4 to 6 black, peglike spines on the mesal face of the caudo-ventral arc, fig. 476 eliaga, p. 132. 468 D 469 D CONTORTA 470D ANISCA 47ID TARSALIS 472D STYLATA Figs. 466-472.—Ochrotrichia, male genitalia. A, lateral aspect; B, dorsal aspect; C, ventral aspect; D, tenth tergite, dorsal aspect; F, Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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