I wasn't sure about this one. Could this be
vomitoria? The yellowish setae on the postgena didn't seem very prominent, and weren't as brightly colored as the others present. The parafacials seem reddish, which brought to mind
terraenovae.
UPDATE: Upon close scrutiny of the original images, I found this individual in fact has three postsutural intra-alar bristles. See
this couplet of the Blow Flies of Eastern Canada photo key, and the
livida species page
here. This characteristic narrows the possibilities to
coloradensis and
livida. The black genal dialation should make this
Calliphora livida. Compare to
this specimen of
livida (the top one, mislabeled in image as
vomitoria) by Tony Thomas on Diptera.info forum.