Charley, How to best try to overwinter these? (always two problems, moisture and temperature) And how would you prefer to have similar gall species posted in the future: ID request or Cecidomyiidae? Thanks.

It looks like there's an exit hole in at least one of these, but Gagne does say this species "presumably overwinters as full-grown larvae in the last generation of galls." I don't have too much experience with keeping things over winter--I've mostly collected overwintering galls late in the winter and just put them in jars to see what emerged--but right now I have some tortricid larvae that I'm keeping over the winter, and I'm following Terry Harrison's advice: keep in a ziploc bag in the fridge until the weather cools down for good, and then transfer the bag to a translucent (e.g. tupperware) container in an unheated place that gets natural light but not direct sunlight, such as a porch or garage. The ziploc bag seems to be a good way to retain moisture, and the windowed porch/garage location will allow the larvae/pupae to experience the right photoperiod/temperature cues so that they know when spring has arrived.

As for posting, ID Request is the place I check most regularly, since my interests are scattered across many taxa. I look at the unidentified galls section once in a while, so that would be a good second choice. If you posted to Cecidomyiidae I would find it eventually, when I go to make a guide page for something else, but I'm not in the habit of looking there for images needing moving.