Eastern Long-horned Milkweed Beetles (Tetraopes tetraophthalmus), mating on Common Milkweed flowers (Asclepias syriaca), July 13, 1979. Town of Manchester, Ontario County, south of Palmyra, NY... © Dave Spier [low-res scan of Kodachrome 64 slide # 334-25] Shot with a Canon film camera and macro lens [details not recorded]
Tetraopes tetrophthalmus (Coleoptera: Polyphaga: Chrysomeloidea: Cerambycidae: Lamiinae: Tetraopini). Sky Meadows State Park, Fauquier County, VA. 04 July 2006
Type "beetle red milkweed" into BugGuide.net and you'll find that this is called, strangely enough, a Red Milkweed Beetle. More info: www.texasento.net/tetrophthalmus.htm
Two milkweed beetles were apparently mating on the milkweed.