. Bulletin. Natural history; Natural history. 128 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 Apex of claspers with only 1 or 2 apico-mesal black spines, fig. 477. arva, p. 132 12. Tenth tergite heart shaped, the apex pointed, the styles arising near meson; internal structure of eighth sternite not conspicuous, fig. xena, p. 130; unio, p. 129 Tenth tergite triangular, apex round- ed, the styles arising from lateral margin; internal structure of eighth sternite frequently sclerotized and conspicuous, figs. 479-484 13 13. Eighth sternite with apical margin produced into a low,
. Bulletin. Natural history; Natural history. 128 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 Apex of claspers with only 1 or 2 apico-mesal black spines, fig. 477. arva, p. 132 12. Tenth tergite heart shaped, the apex pointed, the styles arising near meson; internal structure of eighth sternite not conspicuous, fig. xena, p. 130; unio, p. 129 Tenth tergite triangular, apex round- ed, the styles arising from lateral margin; internal structure of eighth sternite frequently sclerotized and conspicuous, figs. 479-484 13 13. Eighth sternite with apical margin produced into a low, distinct lobe; mesal area of internal structure with spicules, fig. 479. . tarsalis, p. 130 Eighth sternite with apical margin nearly straight or merged with ninth and the boundary between them in-. ARVA Figs. 'i73-477.—Ochrotrichia, male genitalia. J, lateral aspect; C, ventral aspect; D, tenth tergite, dorsal aspect; E, tenth tergite, right 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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