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Scientific Name Mystacides sepulchralis Habitat Ponds, lakes and larger, slower rivers. Seasonality Adults can be found in mid-summer. Identification Adults are generally blue-black, with the wings and thorax, an irridencent metallic sheen (Ross, 1944). The male clasper is linear, broad and directed postero-dorsad at a 45 degree angle. Life History Annual. Adults emerge throughout the warmer months. Conservation Common. Diet Info Larvae feed on fine plant material and invertebrates. Range Transcontinental (LaFontaine, 1981), from Newfoundland, west to Alaska (Schmid, 1998).