. Bulletin. Natural history; Natural history. Fig. 281.—Hydropsyche simulans, larva. pupation they spin an ovoid cocoon near the retreat, generally using sand, stones and bits of trash. Characters of both mature and immature stages show no real benefit to be derived by dividing this family in subfamilies. Because it simplifies the keys to treat the entire family as a unit with no established group- ings and combinations of genera to follow, subfamily treatment has been disregarded. KEY TO GENERA Larvae 1. Head with a broad, flat dorsal area set off" by an extensive arcuate ca- rina, fig.
. Bulletin. Natural history; Natural history. Fig. 281.—Hydropsyche simulans, larva. pupation they spin an ovoid cocoon near the retreat, generally using sand, stones and bits of trash. Characters of both mature and immature stages show no real benefit to be derived by dividing this family in subfamilies. Because it simplifies the keys to treat the entire family as a unit with no established group- ings and combinations of genera to follow, subfamily treatment has been disregarded. KEY TO GENERA Larvae 1. Head with a broad, flat dorsal area set off" by an extensive arcuate ca- rina, fig. 415. . Macronemum, p. 114 Head without a dorsal area set off by a carina, fig. 304 2 2. Left mandible with a high thumblike, dorso-lateral projection, fig. 282. . Genus A, p. 83 Left mandible without a dorso-lateral projection, at most with a carina, fig. 283 3 3. Stridulator of front leg forked, fig. 291 4 Stridulator of front leg not forked, fig. 292 5 4. Prosternal plate with a pair of poste- rior sclerites, fig. 293. Basal tooth of mandibles single, fig. 284 Hydropsyche, p. 86 Prosternal plate without a pair of sclerites posterior to it, fig. 294. Basal tooth of mandibles double. fig. 285 Cheumatopsyche, p. 108 5. Quia rectangular and long, separating genae completely, fig. 296; each branched gill with all its branches arising at top of basal stalk, fig. 298 6 Gula triangular and short, genae there- fore fused for most of their length,. 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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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
