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Show 98 Genus The occurring unforked (2) genus from all other in Idaho: Adults. (1) and with claws subequal combinations following this tinguish Parameletus Bengtsson of or each the costal tarsus shorter than without bands absent on maxillae; pincer-shaped (Fig. Of this and Siphlonuridae of hind single wings the hind Nymphs. (1) on each 6); (Fig. tarsi are Abdominal segment, and (Fig. 3); (2) pectinate spines (3) distal segment of labial palpi 21). P. species, one (3) and tibiae. four North American genus, Vein MP of dis to serve projections obtuse the lamellae characters genera similar; gills semi-cordate, sclerotized of 1908 species presently columbiae assigned McDunnough occurs to in Idaho. Parameletus columbiae McDunnough (Figures 3, 6, 20-21) Parameletus columbiae McDunnough, McDunnough (1938) described series of adults McDunnough (1938) the adults, Taxonomy As and 1938: 31. this species from collected in British Columbia, and a Canada. Spieth (1938) provide descriptions and Edmunds (1952b) of the adults and nymphs. Biology this 1s the only species presently known from of |