The field marks most apparent to me are the short bill, prominent eye-ring, white throat, and the yellowish belly. When I encountered a local expert birder shortly after I got the shot, he said Least Flycatcher when I mentioned the bold eye-ring. The wings do appear to be shorter in comparison to the tail length, but what about the yellow belly?
image made on 5-17-13 at Eagle Creek Park in Indianapolis, Indiana
Help is appreciated!:S3:

