Moved from Lasioglossum.

male

note dark wings

We have some small black bees, which look just like the picture on the dandelion flower, in an old wooden birdhouse at my mother-in-law's. They were discovered Sunday, when my stepson-in-law was stung on the top of his head. He and my stepson were doing yard work for my mother-in-law. This afternoon my husband was working in the yard and one tried to sting him. What can we do to get rid of them without harming them? We have grandchildren who play in the yard on Sunday, and we do not want them harmed. Both my stepston and mother-in-law are allergic. Please post an answer to our problem as soon as possible.

This is a species of Lasioglossum, most likely the subgenus Evylaeus (normally non-metallic).

Probably a male halictid or andrenid. The abdominal bands are at the anterior (front) portion of each segment. That might be diagnostic. In another genus, the abdominal bands are at the posterior (hind) margin of each segment. I just can't remember which situation is associated with which genus:-)