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I found some information in ?British Soldierflies??
1. Tabanidae eggs wtite or white-yellow freshly lay, than become dark to deep black.
2. Chrysops put eggs in one layer, 15-20 degree to substrate.
Both fact are visible on my photo:
http://www.diptera.info/forum/viewthread.php?forum_id=5&thread_id=1767&pid=7220#post_7220
3. Hybomytra and Tabanus eggs lay in 3-4 layers, angle to substrate 45-50. Looks like ?inverted fan? (I don?t know what is it).
So, I think Hybomytra-Tabanus is correct.