I walk into my vegetable garden and all is calm for about a minute, then these bugs come out of nowhere -- hundreds of them -- and buzz around me and the entire garden. They don't appear to be eating any of the vegetables; my thought is that they may be living in the mulched paths (straw), but I dig around and find no evidence of them. Any thoughts? I have never seen them in past years. They do not bother me if I am on the grass surrounding the garden and I don't see them anywhere except my garden. Any suggestions as to what they are and how to get them to leave me alone will be greatly appreciated.