. Bulletin. Natural history; Natural history. 30 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 two-thirds distance from base of tibiae, fig. 74 Brachycentridae, p. 260 Middle tibiae without spines, their tarsi with only a scattered few in addition to apical ones, preapical spurs of tibiae hairy, longer and situ- ated at middle of tibiae, fig. 75 Lepidostomatidae, p. 258 RHYAGOPHILIDAE The adults, both sexes, of the Rhyaco- philidae have five-segmented maxillary palpi. Two distinct groups are included in the Illinois representatives of this family; the subfamily Rhyacophilinae has fr
. Bulletin. Natural history; Natural history. 30 Illinois Natural History Survey Bulletin Vol. 23, Art. 1 two-thirds distance from base of tibiae, fig. 74 Brachycentridae, p. 260 Middle tibiae without spines, their tarsi with only a scattered few in addition to apical ones, preapical spurs of tibiae hairy, longer and situ- ated at middle of tibiae, fig. 75 Lepidostomatidae, p. 258 RHYAGOPHILIDAE The adults, both sexes, of the Rhyaco- philidae have five-segmented maxillary palpi. Two distinct groups are included in the Illinois representatives of this family; the subfamily Rhyacophilinae has free-living, predaceous larvae and the subfamily Glos- sosomatinae has saddle-case making larvae. This remarkable difference in habits of the larvae has no apparent outstanding counter- part in the adults. The southvi^estern genus Jtopsyche has been placed in the subfamily Hydrobiosinae, but until the larvae of this genus are discovered its true position is enigmatic. KEY TO GENERA Larvae 1. Anal larvapods with long, large hooks, figs. 22, 91. Free living without cases Rhyacophila, p. 32 Anal larvapods with very small, re- tractile hooks, fig. 23. Living in saddle-shaped cases constructed of small stones 2 2. Pronotum notched only at extreme antero-lateral angle, at which point the legs are attached, fig. 92 Glossosoma, p. 39 Pronotum narrow from anterior mar- gin to middle, the legs attached at this central point, fig. 93 3 3. Dorsal plate of last segment with 4 long, apical setae; pronotum with only a few scattered setae; anal hook divided into many teeth, fig. 96. . Protoptila, p. 41 Dorsal plate of last segment with 6 long, apical setae, fig. 94; pronotum with a line of setae near posterior margin, and with a brush of setae along each anterior corner, fig. 93; anal hook with only 1 large and 1 small tooth, fig. 95 Agapetus, p. 39 Pupae 1. Mandibles with inner margin minutely serrate, and with apical inner tooth. Fig. 91.—Rhyacophila lobijera larva, anal hook. Fig. 92.—Aga
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