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Photo#186758
The plot thickens 5/29/08 - Syrphus

The plot thickens 5/29/08 - Syrphus
Churchville Nature Center, Bucks County, Pennsylvania, USA
May 29, 2008
Size: 7-8 mm.
Instead of a Syrphid fly, a wasp emerged from this cocoon or puparium.
5/31/08

Related images here.

Update: According to this article, Natural enemies and insecticides that are detrimental to beneficial Syrphidae, a parasitized puparium can be identified early on by its dark, brassy or slightly greasy sheen and its different shape. Emergence takes a little longer than for flies from non-parasitized puparia. This is clearly the case with this one.

Moved
Moved from Syrphini.
Other pupae, larvae and adults in the same group were identified as Syrphus.

Moved
Moved from Syrphid Flies.

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