. Bulletin. Natural history; Natural history. September, 1942 Prison : North American Plecoptera 273 with pattern of dark brown markings as in fig. 39. Pronotum with raised rugosi- ties and a narrow, yellow, longitudinal median line. Terminal abdominal tergites with groups of small spinulae arranged as. 9SUBGENITAL PLATE (JABDOMINAL STERNITES Fig. 39.—Acroneuria arida. in fig. 39. Genital hooks or modified sub- anal lobes of the finger-like type with a distinct notch on inner margin at tip. Ninth sternite with a small, nearly round, padlike disk. Subanal lobes show no trace of gill remnants. A
. Bulletin. Natural history; Natural history. September, 1942 Prison : North American Plecoptera 273 with pattern of dark brown markings as in fig. 39. Pronotum with raised rugosi- ties and a narrow, yellow, longitudinal median line. Terminal abdominal tergites with groups of small spinulae arranged as. 9SUBGENITAL PLATE (JABDOMINAL STERNITES Fig. 39.—Acroneuria arida. in fig. 39. Genital hooks or modified sub- anal lobes of the finger-like type with a distinct notch on inner margin at tip. Ninth sternite with a small, nearly round, padlike disk. Subanal lobes show no trace of gill remnants. Allotype, male.—Knoxville, Tenn.: June 21, 1939, A. C. Cole. The subgenital plate of the female of arida was figured by Banks at the time of the original description of valida, but to aid recognition of this species another illustration of this structure, fig. 39, is presented. The nymph of this species has not as yet been discovered. In addition to the records from North Caro- lina and Philadelphia (Pennsylvania) given in the original descriptions, I can now add the following. Georgia.—Summerville: June 9, 1937, P. W. Fattig, S$, 7$. Ringgold, Chickamauga Creek: June 14, 1939, P. W. Fattig, 56, 6$. Ball Ground: June 27, 1932, P. W. Fattig, 1$. Ellaville, Cedar Creek, miles north: May 26, 1939, P. W. Fattig, 2 $ . Tennessee.—Knoxville: April 24, 1936, C. B. Huffaker, 1? ; May 26, 1936, C. B. Huf- faker, 1^ ; June 1, 1936, D. A. Johnson, 1^ ; June 6, 1936, D. A. Johnson, 1^ ; May 22, 1939, A. C. Cole, 2? ; June 14, 1939, A. C. Cole, 1$ ; June 21, 1939, A. C. Cole, 2$, 4$. Sevierville: June 11, 1938, at light, T. H. Frison & T. H. Frison, Jr., 1$. Greenbrier Cove, Smoky Mountains: June-July, 1940, A. C. Cole, \$, 19. Monteagle: A. C. Richards, 2$. Acroneuria evoluta Klapalek Acroneuria evoluta Klapalek (1909, p. 245). Original description, $. Larva No. 1—Garman (1912, p. 59, fig. 47). Nymphal description. Acroneuria arida Needham & Claassen (1925, p. 185). I
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