Ground Beetle

Scientific Name: Harpalus affinis (or similar Harpalus species)

Order & Family: Order Coleoptera, Family Carabidae

Size: 10 to 12 mm (0.4 to 0.5 inches)

Ground Beetle

Natural Habitat

Typically found in leaf litter, under rocks, in gardens, fields, and urban areas

Diet & Feeding

Omnivorous; feeds on small insects, larvae, and various plant seeds (granivory)

Behavior Patterns

Night-active (nocturnal) hunters that move quickly; they are often attracted to artificial lights at night and may wander indoors through small gaps

Risks & Benefits

Beneficial to ecosystems and gardeners as they prey on agricultural pests like slugs and caterpillars. They are harmless to humans, though they may emit a pungent odor or bite if handled roughly.

Identified on: 4/27/2026