. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 137. Fig. 498.—Oxyethira serrata, case. of the year, from May to the middle of July; the number of generations per year has not been determined. In local areas around these lakes the species sometimes occurs in tremendous numbers, swarming around lights. Little is known concerning the range of the species, with records available only from Illinois, New York and Wisconsin. All records, however, indicate a restriction to lakes and connecting channels. Illinois Records.—Antioch : July 7, 1932, Prison & M
. Bulletin. Natural history; Natural history. August, 1944 Ross: Caddis Flies of Illinois 137. Fig. 498.—Oxyethira serrata, case. of the year, from May to the middle of July; the number of generations per year has not been determined. In local areas around these lakes the species sometimes occurs in tremendous numbers, swarming around lights. Little is known concerning the range of the species, with records available only from Illinois, New York and Wisconsin. All records, however, indicate a restriction to lakes and connecting channels. Illinois Records.—Antioch : July 7, 1932, Prison & Metcalf, A$, 9 ?. Chan- nel Lake: May 27, 1936, H. H. Ross, $ $, 5$. Fox Lake: July 15, 1935, at light in town, DeLong & Ross, $ $ , 5 5 ; May 15, 1936, Ross & Mohr, $ $, 9 ?, many pupae, 2 larvae; May 28, 1936, H. H. Ross, $ $, 1 $ ; June 10, 1936, Ross & Burks, 1$. JoHNSBURG, Fox River: May 28, 1936, H. H. Ross, $ $ , ? $ . Oxyethira pallida (Banks) Ortholrichia pallida Banks (1904^, p. 215); &. Oxyethira viminalis Morton (1905, p. 71); Adults.—Length 3 mm. Color a salt- and-pepper combination of cream and light brown, the general tone light. Male geni- talia, fig. 486, with aedeagus split and curi- ously twisted. Female genitalia, fig. 494: eighth sternite produced into a wide, emar- ginate lobe which is sclerotized along the sides; tenth segment fairly long; ninth seg- ment with very long and curved internal rods which extend below and to the side of the bursa copulatrix ; bursa copulatrix short, with a ventral sclerotized bridge. Allotype, female,—Wilmington, Illinois: Aug. 20, 1934, DeLong & Ross. This species was first recorded from Illi- nois in the original description of viminalis, in which Morton recorded material from Lake Forest, collected October 15, 1902, by Professor Needham. We have since taken it in scattered localities in the northern half of the state. Adult emergence occurs throughout the warmer months of the year, from June to Oc
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