. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 117 Macronetnum transversum (Walker) Hy dropsy che transversa Walker (1852, p. 114); 9. Macronema polygrammatum McLachlan (1871, p. 129); d^.' Macronema polygrammaticum Betten (1934, p. 204). Misspelling. As in the case of Carolina, we have not yet taken this species in Illinois but have found it in small numbers in the White River at Shoals and Petersburg, Indiana. We have not actually reared the yellow- headed larva of this genus which we are considering as this species. By a process of elimination, how
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 117 Macronetnum transversum (Walker) Hy dropsy che transversa Walker (1852, p. 114); 9. Macronema polygrammatum McLachlan (1871, p. 129); d^.' Macronema polygrammaticum Betten (1934, p. 204). Misspelling. As in the case of Carolina, we have not yet taken this species in Illinois but have found it in small numbers in the White River at Shoals and Petersburg, Indiana. We have not actually reared the yellow- headed larva of this genus which we are considering as this species. By a process of elimination, however, there seems no ques- tion as to the association. This larva, fig. 417, differs from the others not only in color but in having the posterior portion of the head ridge produced into a pair of tubercles. Little is known regarding the distribution of the species. Available records are from Georgia and Indiana. HYDROPTILIDAE This family comprises most of the "micro" caddis flies. Various members of the family frequent diverse situations, and in Illinois one or more species may be found in al- most any unpolluted lake or stream. Every known Nearctic genus has a representative in the central or eastern states. The adults are hairy and usually have a mottled pattern; the maxillary palpi are five-segmented in both sexes and the wings have either reduced or compressed venation. The pupae, fig. 44, are very uniform in structure and no characters have been found to key them to genus. The larvae are unique in possessing a modified type of hypermetamorphosis. In at least some genera (see Ochrotrichia, p. 125, and Mayatrichia, p. 160) the early in- stars have a slender body fitted for free, active life and have no case. These forms,. '422 423 Fig. 422.—Mayatrichia ayama, apex of ab- domen of early instar larva. Fig. 423.—Ochrotrichia sp., apex of abdomen ot earlv instar larva. fig. 557, have a slender abdomen with the dorsum of each segment sclerotized. The Mayatrichia la
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