Westborough Wildlife Management Area, Westborough, Worcester County, Massachusetts, USA
April 29, 2010
Size: ~1 mm
In March, I collected a white oak leaf from the forest floor and placed it in a Ziploc bag. It has one of these galls:
and several of these:
Yesterday (4/28/10), I looked in the bag and found two of the tiny wasps pictured above, as well as this one, which clearly emerged from the larger gall:
The timing of their emergence makes me wonder if these smaller wasps could be inquilines from the larger gall, but they could have fit inside the smaller galls, so perhaps they emerged from those and happened to do so at the same time as the larger wasp. However, I've looked and haven't found any exit holes in the smaller galls.