. Bulletin. Natural history; Natural history. 164 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 10-12 teeth forming two rows, fig. 575; apical projection of first tergite bifid, figs. 572," 573 4 4. Apical projection of first tergite only moderately produced, the apex wide, fig. 572 Ptilostomis, p. 171 Apical projection of first tergite form- ing a long structure with a narrow apex, fig. 573 Eubasilissa, p. 168 5. Mandibles greatly curved and sickle shaped, fig. 569; fourth tergite with a normal sized, hook-bearing, scle- rotized plate, fig. 576, which nearly equals size of ant
. Bulletin. Natural history; Natural history. 164 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 10-12 teeth forming two rows, fig. 575; apical projection of first tergite bifid, figs. 572," 573 4 4. Apical projection of first tergite only moderately produced, the apex wide, fig. 572 Ptilostomis, p. 171 Apical projection of first tergite form- ing a long structure with a narrow apex, fig. 573 Eubasilissa, p. 168 5. Mandibles greatly curved and sickle shaped, fig. 569; fourth tergite with a normal sized, hook-bearing, scle- rotized plate, fig. 576, which nearly equals size of anterior plate on fifth tergite Phryganea, p. 174 Mandibles only slightly curved, fig. 568; fourth tergite with hook-bear- ing plate absent or not more than half size of anterior plate on fifth tergite, fig. 577 Agrypnia, p. 165 Adults 1. Maxillary palpi 4-segmented, fig. 64; genitalia with an aedeagus, figs. 580, 594 (males) 2 Maxillary palpi 5-segmented; genitalia without an aedeagus, figs. 582, 598 (females) 8 2. Ninth sternite produced as a toothed shelf beyond the bases of the clasp- ers, fig. 594 Ptilostomis, p. 171 Ninth sternite not shelflike, figs. 580, 585 3 3. Claspers produced posterad into a short, slightly upturned point, but rounded and low dorsad, appearing spoon shaped from the side and bis- cuit shaped from below, figs. 603, 604 Phryganea, p. 174 Claspers produced dorsad into either a long process or into appendage- like blades, figs. 580, 585 4 4. Tenth tergite forming two long, black, sclerotized rods, fig. 590; ninth ster- nite with a pair of sharp points, fig. 590. Hind wings banded with black and dark yellow, fig. 588 Eubasilissa, p. 168 Tenth tergite not rodlike; ninth ster- nite sometimes with 1 mesal point but not 2. Hind wings not so banded 5 5. Hind wings almost entirely black, fig. 587 Oligostomis, p. 167 Hind wings with only black spots or markings on a gray or clear ground color 6 6. Ninth tergite forming a transverse, somewhat hood-shaped area arisi
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