. Bulletin. Natural history; Natural history. PRISON: STONEFLIES, OR PLECOPTERA, OF ILLINOIS 411 ytiiiliiriilliiii'll''ll""'f''Vi'''"-""'"""'l "'Iff a rocky bed, the water is usually fairly clear and the current is swift. Rapids below dams are favorite haunts of the nymphs of this species and it is at such places in Illinois that they are most abundant. The nymphs are carnivorous. Dissection of one capitata nymph collected in the Rock river, Rock Island, III., June 27, 1932, revealed an ingested, nearly full grown stone- Hy nymph so well preserved t
. Bulletin. Natural history; Natural history. PRISON: STONEFLIES, OR PLECOPTERA, OF ILLINOIS 411 ytiiiliiriilliiii'll''ll""'f''Vi'''"-""'"""'l "'Iff a rocky bed, the water is usually fairly clear and the current is swift. Rapids below dams are favorite haunts of the nymphs of this species and it is at such places in Illinois that they are most abundant. The nymphs are carnivorous. Dissection of one capitata nymph collected in the Rock river, Rock Island, III., June 27, 1932, revealed an ingested, nearly full grown stone- Hy nymph so well preserved that its identification as Isoperla bilineata was possible. The life cycle of capiiaia undoubtedly takes two and possibly ^i)[j)||||.ll|!l|illlll|ill|l)ll|li(lWff^//jj(;/,|^ aiitpmji;"^. 319 320 three years for completion. The nymphs, fig. 318, are easily recognized by the structural charac- ters utilized in the key to species and Figs. 319-320.—^Eighth and ninth ABDOMINAL SEGMENTS OF NeOphaSgatlO- phora capitata-, n^ viphs. This ubiqui- tous species illustrates the means of seiiarating male and female nymphs by means oF the continuous or interrupteii posterior seta! margins of eighth ster- nites. 319.— Male. 320.—Female. by their conspicuous color pattern. They have been described in detail by Claassen (1931). I'hat author's association of nymph with adult is proved to be correct by our rearings. Adults.—Homer (park): June 30, 1927, 2 6^; June 1, 1931, 4^^. Kan- kakee: July 10, 1925, 1^^,59. Keithsburg: June 9, 1932, 2 cf', 59. Momence: July 17, 1914, 19. Oakwood: June 9, 1926, 39; July 6, 10, 1927, c^d^, 99; June 14, 1930, 3d^. Oregon: June 19-21, 1917, 49; July 9, 1925, 29; July 13, 1926, 19; July 18-19, 1927, cfcf. 99; May 21—June 28, 1928, Icf, 99; June 1929, 49; July 11, 1929, cfd^, 99; June 1930, 69; June 13, 1931, 7cf. Ottawa: June 12, 1901, Icf. Pike: May 26, 1906, 4c^. Rockford: July 18, 1927,"lcf, 19; June 13, 1931, 36d^, 149. Rock Island: June 3,
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Keywords: ., booka, bookcentury1900, bookdecade1910, booksubjectnaturalhistory
