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For Insects, Spiders & Their Kin
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Parasitic Wood Wasp - Orussus occidentalis - male - female

Parasitic Wood Wasp - Orussus occidentalis - Male Female
Sequim, Port Williams, Clallam County, Washington, USA
May 15, 2008
Size: 10mm approximately
I saw a number of interactions in which two individuals would notice each other, usually from several feet apart, approach and then either run off or fly off. As these were always two morphs, one with a striped abdomen and one with a red abdomen, I'm guessing male and female.
More photos, and video, on Olympic Natural History page.

Moved from Orussus.