Diplazon laetatorius - Hover fly parasite? -
Renton, King County, Washington, USA
August 8, 2014
(Updates, mainly retitling and added comment, 11/29/17)
Was unclear whether this wasp was looking to eat aphids (almost looks like it might have one here), or whether it was doing some ovipositing (not sure that's a true word) in some of these, but at one point I saw it with it's abdomen in such a position as if it might be doing some "drilling/piercing"... did not catch the picture in time). It kept flying around nearby cattail reads that were had heavy aphid investations.
Images of this individual: tag all