Small Milkweed Bug

Scientific Name: Lygaeus kalmii

Order & Family: Hemiptera: Lygaeidae

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

Small Milkweed Bug

Natural Habitat

Fields, meadows, and gardens, particularly where milkweed (Asclepias) or other composite flowers are present.

Diet & Feeding

Primarily feeds on milkweed seeds, but also consumes nectar from various flowers and occasionally preys on other insects or their eggs.

Behavior Patterns

They exhibit warning coloration (aposematism) to deter predators. They undergo incomplete metamorphosis and are often seen in groups; adults may overwinter in leaf litter or under bark.

Risks & Benefits

Generally harmless to humans and do not cause significant damage to garden plants. They benefit the ecosystem by participating in the food web and occasionally acting as opportunistic predators of other pests.

Identified on: 3/1/2026