Head: Black, shiny. Mandibles and whiskers (palpi) reddish.
Antenna: Short, not reaching end of thorax. First 3 segments reddish, rest brownish-black.
Thorax (Pronotum): Black, shiny; with an indented line down middle of thorax. Base wider than lower margin, Lower margin outside edge pointed. Side edges rounded, widest before middle, and with a reddish translucent bead or very narrow rim. Lower end of thorax rough (deeply punctured).
Wings (Elytra): Reddish-brown with dark blotches, and darker triangle at base. About 7 or 8 ridges down wings. Outside edges and tip reddish-brown. Tip rounded.
Legs: Short. Thighs (femora) yellowish, with long hairs on underside; rest of legs yellowish-brown, hairy. Male has pads on underside of front feet.
Abdomen: Underside black.
Similar Species: Seedcorn Beetle Stenolophus ochropezus is entirely dark with legs a lighter yellow.
Size: 8 to 10.5 mm.
Habitat: Prefers moist soils; prairies, wet meadows, crop fields edges with dense grass, creek banks.
Food: Weed and grass seeds, also smaller insects like Apple Maggot, Colorado Potato Beetle, Carrot Weevil.
Flight Time: April to August – peaking during June and July.
Life Cycle: Adults overwinter in tunnels in soil, becoming active by April, mating in May. Adults can live up to 3 years. From egg to adults takes about 40 days. Attracted to lights.
Comments: Widespread in Ontario. Listed in Harrow by Candensys.
For information on synonyms, references and type specimens see next page