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Unidentified Larvae and Puparia

Unidentified Larvae and Puparia
Santa Clara, Santa Clara County, California, USA
September 27, 2008
Size: 0.25"
I have been studying a patch of dillweed in a meadow near my school for a few weeks now and found several of these very small green caterpillars all over it. They look like little jelly bellies. I am tempted to say they are some sort of swallowtail, but only because it is the only species I am aware of that feed on dillweed. Any ID help is appreciated. Thanks in advance.

I think it might be...
a syrphid fly larva. Take a look at the images here. They would be feeding on aphids, rather than the plant.

Syhrphid fly larva
Thank you Charley. That makes perfect sense now that you mention it. The dill weed was covered with aphids and lady bugs in all their various forms of metamorphosis. Thanks for the ID.

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