Amphasia sericea

Ground Beetle
Amphasia sericea

Identification:

Ground Beetle Amphasia sericea came to moth lights Jul 12-11. Photo 2 of 3, Wheatley, Ontario.
Ground Beetle Amphasia sericea came to moth lights Jul 12-11. Photo 2 of 3, Wheatley, Ontario.

Head: Black, short and shiny. Large eyes. Whiskers (palpi) brownish-yellow.
Antenna: Long and thin, extending past base of wings. First 3 segments brownish-yellow, rest are dark brownish with each segment tip slightly lighter (annulated).
Thorax (Pronotum): Dull black, rough (punctured), with yellowish pile along lower half.  Thorax slightly wider than long, base and lower margin of equal width; sides rounded. The rim, or shelf on side edges are very narrow at base, but widen significantly, and appear flattened at lower margin.

Ground Beetle Amphasia sericea came to moth lights Jul 12-11. Photo 1 of 3, Wheatley, Ontario.
Ground Beetle Amphasia sericea came to moth lights Jul 12-11. Photo 1 of 3, Wheatley, Ontario.

Wings (Elytra): Long, dull black, covered with dense, yellowish pile. About 8-9 faintly indented lines down wings. Tips pointed, abdomen usually protruding slightly.
Legs: Thighs (femora) slightly wide, shiny black. Rest of legs dull reddish-brown. Hind shin (tibiae) and feet long and thin. First joint of hind foot as long as the next 2 joints combined. Male has pads on underside of front feet.
Abdomen: Underside black.

Similar Species: Harpalus spadiceus is the same size and almost identical, but H. spadiceus is shiny and without pile.

Size: 9 to 11 mm.

Habitat: Meadows, fields, orchards with grass.

Food: Adults feed on grass and sedge seeds.

Flight Time: May to July

Life Cycle: Hides under debris and burrows in grass roots. Adults attracted to lights.

Comments: Essex County – Point Pelee National Park. Kent County – Rondeau Provincial Park.

For information on synonyms, references and type specimens see next page