. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 25 membranous ones which contain de- veloping genitalic parts, figs. 42, 43 2 Apex of abdomen with definite, pro- jecting, platelike processes, figs. 570, 571, or finger-like or triangular processes in addition to lobes con- taining developing parts of genitalia, figs. 20, 49-54 4 Mandibles without teeth or serrations, fig. 44 Hydroptilidae, p. 117 Mandibles with either serrations, fig. 97, or distinct teeth, fig. 158 3 Mandibles with teeth grouped near apex, figs. 158-161 Philopotamidae, p. 44 Mandibles
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 25 membranous ones which contain de- veloping genitalic parts, figs. 42, 43 2 Apex of abdomen with definite, pro- jecting, platelike processes, figs. 570, 571, or finger-like or triangular processes in addition to lobes con- taining developing parts of genitalia, figs. 20, 49-54 4 Mandibles without teeth or serrations, fig. 44 Hydroptilidae, p. 117 Mandibles with either serrations, fig. 97, or distinct teeth, fig. 158 3 Mandibles with teeth grouped near apex, figs. 158-161 Philopotamidae, p. 44 Mandibles with teeth near middle, or mandibles only serrate, figs. 97-100 Rhyacophilidae, p. 30 Fifth tergite with only anterior pair of hook-bearing plates, third or fourth tergites with both anterior and posterior pairs, figs. 40, Hydropsychidae, p. 76 Fifth tergite with both anterior and posterior hook-bearing plates, third and fourth tergites at most with anterior pair, fig. 20 5 5. Seventh abdominal tergite without a pair ot sclerotized plates 6 Seventh abdominal tergite with a pair of sclerotized hook-bearing plates, fig. 20 9 6. Apical processes of abdomen short, appearing triangular from dorsal view, sharply curved ventrad from lateral view, fig. 45. .Beraeidae, p. 208 Apical processes of abdomen either much longer, fig. 49, or not curved ventrad 7 7. First abdominal tergite with a short, arcuate ledge near middle of seg- ment, fig. 46; sclerotized plates of. Fig. 49.—Helicopsyche borealis pupa, apical processes, dorsal aspect. Fig. 50.—Lepidostoma liba pupa, apical processes, dorsal aspect. Fig. 51.—Psilotreta sp. pupa, apical proc- esses, dorsal aspect. Fig. 52.—Sericostoma sp. pupa, apical proc- esses, lateral aspect. (After Ulmer.) Fig. 53.—Goera sp. pupa, apical processes, dorsal aspect. (After Ulmer.) Fig. 54.—Limnephilus submonilifer pupa, apical processes, dorsal Please note that these images are extracted from scanned page images that may have
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