Antenna have a dark base and dark clubs at tips. Mid area of antenna are orangish. Legs are all dark and thin. Both front and hind wings have conspicuous black or brownish-black circular spots and dashes. Newly emerged adults have very faint spots. Male and female abdomens are the same length – shorter than wings.
Size: 50 mm long. Larva 8 to 12 mm long.
Flight Time: July and August.
Habitat: Wooded areas. Larvae live in dry tree holes and prefer Oaks Quercus.
Food: Larva feed on soft-bodied insects.
Life Cycle: Lay eggs in late summer in dry tree holes, particularly Oak Quercus. Larvae have been found in fine organic matter, with their legs holding balls of this solid substrate. The winter is usually spent in larva stage in hibernation. Pupate in cocoon spun with silken threads. Adults live only a few weeks. Life cycle is not well-known and larva may spend 1 to 3 years before maturing. Larvae are able to survive long periods of famine by reducing their metabolism.
Comments: Rare. Kent County – Rondeau Provincial Park. Not recorded for Essex County. In Middlesex County per BugGuide; also in Michigan.
For information on synonyms, references and type specimens see next page