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mystery wasp terrorizes aphid colony - Diplazon laetatorius

mystery wasp terrorizes aphid colony - Diplazon laetatorius
Long Beach, Los Angeles County, California, USA
January 9, 2009
Size: about 1 cm
Parasitic wasp, Ichneumon or Braconid perhaps? Poor aphids, heh.

Moved from Ichneumon Wasps.

Diplazon laetatorius
If the aphids were terrorized, they shouldn't have been. Diplazon laetatorius is their friend. It parasitizes aphid-eating larvae of Syrphidae.

Moved from Gelinae.

How was this IDed as Gelinae?

Not sure who moved it here, but in addition to the context, it does seem to closely match the image Domingo linked to below, which Richard Vernier says "must be a member of the Gelinae."

wish we had more experts to sort these. Here is another somewhat similar (to me) that may be Pimpla

More experts would sure be nice. The main difference I see in that image is the black and white banding of the tarsus, which I imagine is the characteristic "banded leg patterning" Ross is referring to for Pimpla.

Foe or friend?
This may be a parasitoid of syrphid fly larvae, which is why it is loitering around aphids. See

I had checked Aphidiinae, which would be the likely suspects for an ichneumonoid parasitizing aphids, and that didn't look similar. This looks like a much better match to my (amateur) eye.

Thank you!
I too was thinking this was some unrepresented member of Aphidiinae, a syrphid parasite never even crossed my mind. But the images don't lie and it seems like a good match - ah well, my aphids live on!

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