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Protophormia terraenovae
It is distinguished by its deep blue coloration and large size and is an important species throughout the northern hemisphere. This fly is notable for its economic impact as a myiasis pest of livestock and its antibiotic benefits in maggot therapy. Also of interest is P. terraenovae’s importance in forensic investigations: because of their temperature-dependent development and their prominent presence on corpses, the larvae of this species are useful in minimum post-mortem interval (mPMI) determination.
There another Blue Bottle fly find in Americas... http://en.wikipedia.org/wiki/Protophormi...
Coleen this is Arthropods (Phylum of Organisms) spotting. So correct your spotting category by edit it.