Found dead on 5/4/2011 in a bag containing a Quercus alba leaf collected on 4/18/2011. I only noticed it because this larger wasp caught my attention.

On looking very closely, I found some tiny blisters along the main vein on the underside of the leaf, with three exit holes through which this tiny wasp could have emerged (along with two others that apparently emerged before I collected the leaf). They were right next to the conspicuous spherical gall from which the parasitoid emerged.