. Bulletin. Natural history; Natural history. 34 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 moderately incised, fig. 126, or not incised at all, fig. 124 3 3. Ninth tergite produced into a long, narrow, forked process which ex- tends over tenth tergite, fig. 122. . vibox, p. 36 Ninth tergite not produced into a forked process, fig. 123 4 4. Tenth tergite heart shaped and point- ed at apex, fig. 123, long and shallow; aedeagus with a U-shaped process at the end of the lateral arms of the aedeagus glaberrima, p. 35 Tenth tergite short and deep, divided down meson, not forming a rou
. Bulletin. Natural history; Natural history. 34 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 moderately incised, fig. 126, or not incised at all, fig. 124 3 3. Ninth tergite produced into a long, narrow, forked process which ex- tends over tenth tergite, fig. 122. . vibox, p. 36 Ninth tergite not produced into a forked process, fig. 123 4 4. Tenth tergite heart shaped and point- ed at apex, fig. 123, long and shallow; aedeagus with a U-shaped process at the end of the lateral arms of the aedeagus glaberrima, p. 35 Tenth tergite short and deep, divided down meson, not forming a round, dorsal plate; aedeagus without U- shaped processes at the end of the lateral arms, figs. 124, 126 5 5. First segment of claspers with ventral margin almost straight from base to apex; aedeagus without a ventral plate, fig. 124 fuscula, p. 36 First segment of claspers with ventral margin humped to form a definite shoulder near base; aedeagus with large, scoop-shaped ventral plate below central portion, fig. 126 6 6. Apical segment of clasper incised to form a definite dorsal heel, figs. 126, 127 7 Apical segment of clasper not incised, only sinuate, fig. 125, so that the. FUSCULA I32E Figs. 128-132.—Rhyacophila, female genitalia. J and B, apex of abdomen, ventral and lateral aspect; C, tenth tergite; D, eighth sternite; E, eighth segment, lateral 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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