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so it is some sort of substance. You are correct that the head is normal. The substance was stuck to the antenna and proboscis very well. The antenna and the entire proboscis came off whenever I tried to apply pressure to pull the substance away from the face. I didn't see anything in the alcohol other than tissue and the minerals stuck to the face. I guess this Calliphorid was licking something sticky :)

I've attached some photos. Thank You Sir Tony.