. Bulletin. Natural history; Natural history. 263 A UNCUS Figs. 262-263.—Nyctiophylax, male geni- talia. A, lateral aspect; B, clasper, caudal aspect. Apex of abdomen with platelike lateral lobes, fig. 264 (females) not keyed 2. Posterior aspect of claspers with mesal lobe produced into a long finger, fig. 263 uncus, p. 70 Posterior aspect of claspers with mesal lobe no higher than lateral lobe, fig. 262 vestitus, p. 70 Nyctiophylax vestitus (Hagen) Polycentropus vestitus Hagen (1861, p. 293); 9. Polycentropus affinis Banks (1897, p. 30); d^. Nyctiophylax moestus Banks (1911, p. 359); Larva.—U
. Bulletin. Natural history; Natural history. 263 A UNCUS Figs. 262-263.—Nyctiophylax, male geni- talia. A, lateral aspect; B, clasper, caudal aspect. Apex of abdomen with platelike lateral lobes, fig. 264 (females) not keyed 2. Posterior aspect of claspers with mesal lobe produced into a long finger, fig. 263 uncus, p. 70 Posterior aspect of claspers with mesal lobe no higher than lateral lobe, fig. 262 vestitus, p. 70 Nyctiophylax vestitus (Hagen) Polycentropus vestitus Hagen (1861, p. 293); 9. Polycentropus affinis Banks (1897, p. 30); d^. Nyctiophylax moestus Banks (1911, p. 359); Larva.—Unknown. Adults.—Length 5-7 mm. Color various shades of brown, the wings with light spots in an irregular pattern. Male genitalia, fig. 262: tenth tergite semimembranous, short, narrowed at apex; cerci forming a some- what ovate lobe with a sharp process on the mesal face near venter; claspers appearing narrow from lateral view, the extreme base produced into a short shelf, the apical por- tion with a broad, concave, posterior face which is divided at apex into a pair of short lobes, the inner one small. Female geni- talia, fig. 264: lateral lobes of eighth ster- nite short and wide; bursa copulatrix vari- able, but always with a shieldlike structure. In Illinois this species occurs associated with a wide variety of small to large streams over most of the state. Adult emergence begins in May and continues until at least September. The species is apparently widespread through the Northeast and continues south- westward through the Ozarks to Oklahoma. We have records from Arkansas, Illinois, Indiana, Kentucky, Maryland, Michigan, Minnesota, New York, North Carolina, Ohio, Oklahoma, Ontario, Quebec, Tennes- see and Wisconsin. Illinois Records.—Many males and fe- males, taken May 19 to September 20, are from Algonquin, Alto Pass (Union Spring), Antioch, Apple River State Park, Barton- ville (Kickapoo Creek), Charleston, Coun- cil Hill (Galena River), Danville (Middle. Fig. 2
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