. Bulletin. Natural history; Natural history. 'â v' 'P nif'/Si'iVl ^. Fig. 55.âPotamnttllius sp., mature nymph, dorsal aspect. brown. All legs greatly reduced, semi- membranous, nonfunctional. Known from Alabama, Arkansas, Geor- gia, Illinois, Kansas, Manitoba, Missouri, Nebraska, Ontario, and Tennessee. De- velops in large, slow rivers. Illinois Records.âAlton: Aug. 29, 1913, 29. : C. C. Adams, 10 9. Champaign: Sept. 21, 1892, C. A. Hart. 19. Elizabethtown : at light, July 14, 1948, Mills & Ross, 19. Grand Tower: Aug. 14, 1898, C. A. Hart, 73 i . Havana: Aug. 10, 1889, C. A. H
. Bulletin. Natural history; Natural history. 'â v' 'P nif'/Si'iVl ^. Fig. 55.âPotamnttllius sp., mature nymph, dorsal aspect. brown. All legs greatly reduced, semi- membranous, nonfunctional. Known from Alabama, Arkansas, Geor- gia, Illinois, Kansas, Manitoba, Missouri, Nebraska, Ontario, and Tennessee. De- velops in large, slow rivers. Illinois Records.âAlton: Aug. 29, 1913, 29. : C. C. Adams, 10 9. Champaign: Sept. 21, 1892, C. A. Hart. 19. Elizabethtown : at light, July 14, 1948, Mills & Ross, 19. Grand Tower: Aug. 14, 1898, C. A. Hart, 73 i . Havana: Aug. 10, 1889, C. A. Hart, 1 9 ; White Oak Creek, Aug. 14, 1896, C. A. Hart, 39. Momence: Aug. 16, 1938. Ross & Burks, 19. Oquawka: Sept. 26, 1947. H. H. Ross, 30 9 . QuiNcv: Aug. 10, 1889, C. A. Hart, 19. Shawneetown: Oct. 3, 1942, Krison & Ross, 19. Urbana: at light. Aug. 23, 1943, H. B. Petty, 5 9 ; Sept. 20, 1909, 2 9. 2. CAMPSURUS Eaton Campsurus Eaton (1868:83). The adults of Campsurus differ from those of Tortopus mainly in the structure of the legs; the middle and hind legs in both sexes in Campsurus are completely aborted beyond the trochanters. The difference in the wing venation between the two, de- scribed by Needham & Murphy (1924:23) when they defined the genus Tortopus, is not reliable, according to Ulmer (1942:108). Campsurus decoloratus (Hagen) (1861: 43), known from Texas and Mexico, and circumfiuus Ulmer (1942:110), described from Texas, are the only known Nearctic species. C. ptiella (Pictet) (1843:145), described from Louisiana, has been tenta- tively placed in Campsurus, but is at present unidentifiable. POTAMANTHINAE The subfamily Potamanthinae corresponds to Ulmer's family Potamanthidae (1933: 199). It has only one Nearctic genus. 3. POTAMANTHUS Pictet Potamanthus Pictet (1845:208, pi. 25). The adults are fairly large, whitish may- flies with the vertex and the dorsum of the thorax light reddish brown. The marginal intercalary veins of the wings are not net- li
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