Please help ID this fly trapped on an apple-maggot trap
 

I just put out some tangle-trap coated red balls to reduce the apple
maggot infestation [this is in Seattle]. By the end of the day I had
at least 6 of these flies, about 8mm body length. I've posted a photo
of one of them:

http://www.flickr.com/photos/lislitam/4622995487/

This doesn't look like an apple maggot - I'd hate to be trapping
something innocuous!

Anyone with a clue - I'd appreciate it.