I hope that Philippos will be safe on his travels. My instincts tell me to worship Myiagros (‘He Who Chases the Flies’).
An Elean myth tells of how Herakles was troubled by flies when he was trying to sacrifice at Olympia, and was instructed in how to sacrifice to the Zeus who shoos away flies (Ἀπόμυιος), so that the flies were at once driven across the Alpheus. The Eleans make sacrifices either to the flies themselves, or to Zeus Apomyios or a god named Myiodes or Myiakores. There is a similar ritual among the Akarnanians. The intention is to ward off flies in advance of an animal sacrifice, but in some places flies are a problem at other times too.