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Dear Val, I feel flattered to be regarded as "the only and the very best expert", but don't I hear a slight sarcasm? I really know my poor skill! So Bernhard's key is our only rock in troubled waters... O. porcus was new to me, but I found your helpful paper https://www.resea...e_Otitinae and learned that it has orange legs and occiput, whereas these parts of my flies are black.
OK, let's stay with the assumption and wait for future enlightenment. Thanks!
Claudia