These are a few asilids I picked up in French Guiana, collected along forest edges in clearings where they sun themselves. When compared to bees of the genus Eulaema it is clear that they are very strong mimics but it is unclear to me why they copy Eulaema and not one of the other, commoner bees. Perhaps because the colours of Eulaema are closer to the normal colour patterns (black, brown & yellow) of other asilids?
A Eulaema to compare them to:
(scale marks are 1mm apart in groups of 5mm)