Red Milkweed Beetle

what is it?
I found several of these on milkweed flowers and leaves today and watched this one eating the leaf in the picture. I live in southern Ontario, Canada. Can you tell me what it is? What else it likes to eat?
love your site, and BugGuide, too!
Valerie

Hi Valerie,
The Red Milkweed Beetle, Tetraopes tetraophthalmus, is a Longhorn Borer. It feeds exclusively on milkweed. The larvae bore in the stems and roots and the adults are immune to the poison in milkweed. These beetles can squeak loudly by stridulating their thoracic areas together.

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