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Prostoia (Nemouridae); Middle Fork Nooksack River; found beside river where Mosquito Lake Rd crosses the river. Keyed out using 5th Ed. of Intro to Aquatic Insects of North America.
Photos: 1) entire insect, 2) circular labial palp, 3) no cervical gill remnants, 4) anterior dorsal view, 5) posterior ventral, 6) vesicle on ventral abdomen, 7) male epiproct, lateral, 8) male terminal segments, ventral, 9) another view of no cervical gills, 10) male epiproct, oblique view, 11) male epiproct dorsal view