. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 31 no larger than basal one; each man- dible with 2 or 3 inner teeth, fig. 97 Rhyacophila, p. 32 Mandibles with inner margin not ser- rate, and with apical inner tooth. Fig. 102.—Protoptila maculata, front tibia. Fig. 103.—Agapetus illini, front tibia. Fig. 104.—Rhyacophila vibox, front tibia. Fig. 105.—Palaeagapetus celsus, head and pronotum. Fig. 106.—Rhyacophila vibox, head and pro- notum. Fig. 107,—Agapetus illini, head and prono- tum. Fig. 108.—Glossosoma intermedium, head and pronotum. Fig. 109.—Aga
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 31 no larger than basal one; each man- dible with 2 or 3 inner teeth, fig. 97 Rhyacophila, p. 32 Mandibles with inner margin not ser- rate, and with apical inner tooth. Fig. 102.—Protoptila maculata, front tibia. Fig. 103.—Agapetus illini, front tibia. Fig. 104.—Rhyacophila vibox, front tibia. Fig. 105.—Palaeagapetus celsus, head and pronotum. Fig. 106.—Rhyacophila vibox, head and pro- notum. Fig. 107,—Agapetus illini, head and prono- tum. Fig. 108.—Glossosoma intermedium, head and pronotum. Fig. 109.—Agapetus illini, hind wing. Fig. 110.— Glossosoma intermedium, wings. larger than basal one; each mandible with 2 inner teeth 2 2. Apical inner tooth of mandibles half as long as apical blade and sub- parallel with it, fig. 98; mandibles in repose over-reaching side of head, fig. 101; size small, less than 4 mm. Protoptila, p. 41 Apical inner tooth of mandibles much shorter, fig. 100; mandibles in re- pose not reaching side of head; size larger, over 5 mm 3 3. Apical inner tooth of mandibles only slightly larger than basal one, fig. 99; apical segments of abdomen only slightly curled ventrad Agapetus, p. 39 Apical inner tooth of maftdibles many times larger than basal one, fig. 100; apical segments of abdomen curled ventrad and slightly forward Glossosoma, p. 39 Adults 1. Front tibiae with apical spurs absent or hairlike, fig. 102 Protoptila, p. 41 Front tibiae with both apical spurs prominent and sclerotized, fig. 103 2 2. Front tibiae with a preapical spur, fig. 104 Rhyacophila, p. 32 Front tibiae never with preapical spur, fig. 103 3 3. Pronotum with mesal pair of warts nearly touching; posterior warts on head large, arcuate, tapered to a curved, narrowed point, the two nearly meeting on meson, fig. 105. Palaeagapetus, p. 38 Pronotum with mesal pair of warts well separated by a concave area; posterior warts of head oval or round and widely separated on meson,
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