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Small Wasp - female

Small Wasp - Female
Port Angeles, Clallam County, Washington, USA
September 2, 2008
Size: ~ 6 mm
Small wasp with red abdomen laying in Entire-leaved Gumweed, Grindelia integrifolia.
Might this be a parasite or parasitoid where the eggs or larvae attach to other visiting insects?

Images of this individual: tag all
Small Wasp - female Small Wasp - female Small Wasp - female

Moved from Lytopylus.

Lytopylus sp., possibly bakeri (Muesebeck). Det. Dr. Michael Sharkey. He says that, in most of the literature, bakeri had been placed in Agathis or Bassus.

Moved from Agathidinae.

The eggs are inserted into larvae of Lepidoptera.

Moved from Ants, Bees, Wasps and Sawflies.

"The eggs are inserted into larvae of Lepidoptera."

Of very small larvae that are in the flower? I have seen caterpillars of various sizes on these flowers, but in the two shots I have of this wasp obviously ovipositing, there's no host visible.

First Instar
According to Sharkey (2006), most Agathidinae "...are solitary, attack first instar Lepidoptera larvae in concealed microhabitats such as leaf-rolls or stems, and emerge from the last larval instar after it has spun its cocoon."

Cool. I'll check out the paper.