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I see - sometimes Tolmerus and Machimus are treated as congeneric. I am adapted to botanical terminology: a "complex" comprises closely related (micro)species of the same genus, so when you said "Machimus complex" to me it was clear that the fly belonged to genus Machimus in any case, while Tolmerus is a different genus. However, systematics of these genera has obviously not been settled to date, as the paper by Dikow (2009) underlines (http://www.tdvia...._2009b.pdf). The Asilidae Atlas by Geller-Grimm (http://www.robbe...himus.html) speaks of the "Machimus-group" - ok, "group" or "complex" might be used synonymously ;).
Anyhow, now I know that it is no Neoitamus: the ovipositor is too short, and the long and sharply bent postocular bristles are lacking |t.