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Hello dipterists

I saw these two robberflies on Monday in Croatia - Island Rab. I think it can be Machimus setibarbus, but i want determination from some good dipterist. Both of them were big - ca 3 cm.
Photo:

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Females are very hard (if possible at all) to determine from photgraphs. Top of all tibia is red that would exclude setibarbus which has entirely black legs. Can`t see the legs of the victim. I would say M. cf rusticus.

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Hi Reinoud,

Thx! I can see only one tibia of the victim, but the top is red.