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Leucopis? - Leucopis

Leucopis? - Leucopis
Santa Cruz, Santa Cruz County, California, USA
September 26, 2014
Considering the comments on this photo: and its location a few mm from an adult Leucopis fly I believe this is a Leucopis larva. (For some reason ants do not disturb these which are often seen in aphid colonies).

Moved from Flies.

Probably Leucopis
It's not Syrphinae. Among Chamaemyiidae, the feeding habit rules out any genus other than Leucopis. The other aphid predators in the family specialize on genus Cinara (conifer aphids).

This little colony was doomed!
See what was also right there! I don't know the species, but I think it's fair to say it's predatory towards aphids.

It should be noted that the only thing left of this colony a few days later were aphid fragments.

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