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A new stonefly species, Cosumnoperla sequoia, is named from an intermittent stream in the southern Sierra Nevada, California. The adult male and female, mature larva, and egg are described, illustrated, and compared with Cosumnoperla hypocrena Szczytko and Bottorff. The adult males of C. sequoia mos ...

Collections of adult stoneflies over a full year at Irish Gulch Creek, Mendocino Co., California, revealed 23 species. Adults were present at all times of the year. Species number varied from an autumnal low of 2 to a springpeak of 13. Adults of most species were present for less than 3 months, but ...