. Bulletin. Natural history; Natural history. September, 1942 Prison: North American Plecoptera 287. Nymphal maxilla Fig. 54.—Claassenia arctica. listed above, I present the following additional data from the Illinois Natural History Survey collection. Montana.—Varney, Madison River: July 29, 1937, P. Jennings, 1 nymph. Glacier Na- tional Park, Logging Creek: July 11, 1940, H. H. & J. A. Ross, 2 nymphs, 1 exuvia. South Dakota.—Spearfish: July 25, 1924, \i ; July 27, 1940, T. H. Prison & T. H. Prison, Jr., 3 exuviae. Washington.—Seattle: C. V. Piper (col- lection of N. Banks), \$ ; Ceda
. Bulletin. Natural history; Natural history. September, 1942 Prison: North American Plecoptera 287. Nymphal maxilla Fig. 54.—Claassenia arctica. listed above, I present the following additional data from the Illinois Natural History Survey collection. Montana.—Varney, Madison River: July 29, 1937, P. Jennings, 1 nymph. Glacier Na- tional Park, Logging Creek: July 11, 1940, H. H. & J. A. Ross, 2 nymphs, 1 exuvia. South Dakota.—Spearfish: July 25, 1924, \i ; July 27, 1940, T. H. Prison & T. H. Prison, Jr., 3 exuviae. Washington.—Seattle: C. V. Piper (col- lection of N. Banks), \$ ; Cedar River, April 1, 1939, L. Lambuth, 2 nymphs. Wyoming. — Yellowstone National Park, Oardiner River, Yellowstone River, Cascade Creek and Nez Perce Creek: July 30-Aug. 3, 1940, T. H. Prison & T. H. Prison, Jr., many nymphs, $ $, $ $. Grand Teton National Park, Taggart Creek: Aug. 7, 1940, T. H. Prison & T. H. Prison, Jr., 3 nymphs, 1 exuvia. Daniel, Green River: Aug. 13, 1940, T. H. Prison & T. H. Prison, Jr., 1 exuvia. Moose, Snake River: Aug. 6, 1940, T. H. Prison & T. H. Prison, Jr., 6 nymphs, 6 exuviae. Colorado.—Ida: June 19, 1934, 1$. Gun- nison: July 3, 1934, Z$. Estes Park, Big Thompson River: Aug. 4, 1940, T. H. Prison & T. H. Prison, Jr., 2 nymphs, 5 exuviae. Idaho.—Swan Valley, Caribou National Forest: Aug. 28, 1935, H. S. Telford, 1?. Although Claassen (1931) described and figured this nymph, but under the \A'rong name, it seems desirable here to present a new illustration of it, fig. 53, and add illustrations of the mouthparts, fig. 54. PERLODIDAE Perlodes Banks It has been my good fortune to study in considerable detail the types, or what re- mains of them, of Arcyiiopteryx vagans Smith, Arcyiiopteryx aurea Smith, Arcy- iiopteryx lineata Smith, Protarcys bradleyi Smith, Protarcys dolobrata Smith (the ne- allotype only), Dictyopteryx irregularis Banks, Dictyopteryx sigiuita Hagen, Per- lodes slossoiiae Banks, Perlodes yosemite Needh
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