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Represented here are a Western Hercules Beetle, a Cobalt Milkweed Beetle, a common Cucumber Beetle, and an Ironclad Beetle. Also, the background and the patterns in the piece of wood represent tracks (called galleries) made by the adults to raise the larval stage of the beetles, which can sometimes be quite beautiful! (The tracks, not the larvae! Unless you happen to be an entomologist.)
Milkweed is a critical food for the Cobalt Milkweed Beetle, as well as for many other insects including the disappearing Monarch Butterfly.