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No, I havn't seen the female. But once I've seen the foto of Tabanus sp. eggs by entomologist I can trust and it looked just like this one. Also in literature I rad that Tabanidae put black eggs on the leaf over the water surface. Than, the size of all eggs is so large that only large and well feed (like good consomation of our blood) Diptera may put it (of course, if Diptera at all). Am I wrong?