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Hi Greg, what I know about Stomorhina lunata (which is quite common here in Northern Bavaria) comes from these sources:
Olga Sivell (2021): Blow flies
Knut Rognes (1991): Blowflies (Diptera, Calliphoridae) of Fennoscandia and Denmark

But this paper could support you in studying the biology of Stomorhina lunata:
D. J. GREATHEAD (2009): The biology of Stomorhina lunata (Fabricius) (Diptera: Calliphoridae)
DOI:10.1111/j.1469-7998.1962.tb01826.x