This bug has an oval shape and grows up to 5/8 inch long (15 mm). The older adults are black with red markings (A); the younger ones show orange instead of red (B). The nymphs have black legs, antennae, winglets, and a black line behind their heads (C,D,E). Compare with the Small Milkweed Bug (Lygaeus kalmii), which may also be seen on the same host plants. The adults overwinter and may be seen on warm winter days. As the name implies, they may be seen in great numbers later in the season, feeding on milkweed.
These bugs are very common in late summer and fall at both our nature centers wherever milkweed is found.
Eggs are laid in milkweed seed pods. A female can lay as many as 2000 eggs over a month long laying period.
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