(Oncopeltus fasciatus )
Adults are 9/16 to 10/16 inch long, black, and colorfully marked with reddish-orange on the head, sides of the pronotum (part of the thorax), and the wing covers. They have a Y-shaped head marking and two wide crossing orange bands across the wings. They are common on milkweed plants. Milkweed bugs eat the seeds of the milkweed. Their red or red-orange color is a warning to would-be predators that they are very bad tasting food. So they have few enemies. Spiders do prey on them, however.
Dennis Haines reports: You should also see the Common Milkweed Bug (Lygaeus
kalmi )at Kaweah Oaks Preserve. It's smaller and has two white
spots in a black area on the wings when folded over the back.