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Didineis nodosa??? - Didineis nodosa - female

Didineis nodosa??? - Didineis nodosa - Female
Elkton, Douglas County, Oregon, USA
August 2, 2008
Size: approx. 1/2 inch
Several days earlier I'd found one of these on a blackberry leaf. For the next few days, I looked for more on the blackberries but couldn't find any. Then I checked the dried grass not too far from the blackberries. For the next several days, there were a number of these searching through the grass for something. They're industrious little critters, though I never did see one actually find anything.

Is this Didineis nodosa? Maybe another female? What was it looking for?

Yes, female.
Excellent image! She is looking for prey, either leafhoppers or fulgorid planthoppers most likely (little is conclusively known about this genus of wasps). Males have a bizarre hook on the tip of the antenna, and dilated front tarsi ("feet"). See the figure on page 459 of "Sphecid Wasps of the World" by Bohart and Menke, U of Cal. Press, 1976.

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