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oh, I knew about that loose of colouration, now i have a doubt: i use alcohol but i?ve read not to use it with tabanidae because they can loose pilosity important for the identification. Now in a book in keys to Nemorius i see: "eyes with a medial band in living or rehidratated specimens"
Does it mean bands can re-apear after died?? that would be nice for id?s, but i think maybe more probable this is an old book...