Identificaciones de megachile

I collected some fallen coast live oak catkins covered in old galls in a small container, yesterday (http://www.inaturalist.org/observations/156361771, http://www.inaturalist.org/observations/156491874). Today, I found this tiny insect trying to get out. I don’t suppose it came from one of the galls, as it looks like they were evacuated long ago? But it does look like one of the iNat preview photos for Dryocosmus. It even appears to have yellow legs/antennae in Photo #2 and #5…. It’s so small, I thought that it was entirely black even when looking at it in person.