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Photo#597838
From 3-4 mm white oak gall - Ceroptres - male

From 3-4 mm white oak gall - Ceroptres - Male
Mt. Holyoke Range, South Hadley, Hampshire County, Massachusetts, USA
Size: 1.7 mm
Today (11/27/2011) I found two of these dead wasps in the bag containing this gall:

They emerged from two similar galls on the same leaf. I believe they are the same as this:

and I'm a bit skeptical that these are all charipids rather than cynipids. Any thoughts?

Moved
Moved from Philonix nigra.

Going with Zhiwei's original ID, noted on this photo:

Denise's comment was "What I find interesting is that the image you sent me appears to be that of a Ceroptresini and none are known for Philonix nigra, only Synergus."

Moved
Moved from Ceroptres.

 
Ceroptres?
Sure this isn't a male Ceroptres? I am definitely not an expert, wbut we look at a lot of gallers and inquilines in our lab. On this one, the "collar" on the pronotum is wide, so not like a galler, and you can see the little "saddle" on the basal part of the abdomen that is characteristic of this genus. I actually wonder whether any of the adult "Philonix nigra" pictures on BugGuide are actually that species. All of the gallers we rear from Philonix nigra galls are wingless females.

 
I agree these are inquilines,
I agree these are inquilines, most likely Ceroptres based on the same characters Andrew said. I've sent this to Denise Montelongo from Andy Deans' lab, she's working on P. nigra community and should have high quality photos of all the gall inhabitants.

Moved
Moved from Cynipoidea.