Lucilia (superfamily Oestroidea) 7mm

7/13/12 PL DE
-First, this Lucilia is in the Superfamily Oestroidea.
-Usually you can tell the difference between O. and Muscoidea by the sharp bend in vein M towards R4+5.
This Lucilia appears to be one of those exceptions.

Based on the ID help (an annotated picture of acrostichal bristles on the back)
http://bugguide.net/node/view/232115/bgimage
Definition of Acrostichal Bristles:
The acrostichal bristles are a row of bristles on the top surface of the middle part of a fly's thorax (the mesothorax). The bristles run longitudinally, that is, in a line from the head-end in the direction of the rear of the insect.
Some flies have no acrostichal bristles and others will have many. The number and arrangement of these bristles is very important to entomologists as they can often be used to identify the species of fly.
http://www.amentsoc.org/insects/glossary/terms/acrostichal-bristles

notes on similar species:
(Muscid) Neomyia cornicina - seems to be missing bristles in the middle of its back
http://bugguide.net/node/view/529589/bgimage
more given at ID help pic at BugGuide, link above

If the middle thorax (mesothorax), has three rows of bristles then possible L. sericata, L. thatuna, L. cuprina, L. silvarum.

The color of the palps also helps with ID.