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It appeared in a lot of lists in stenopogoninae (i Always wondered why, there is a reason but not yet clear to me : )) @ Piluca, the spur is far from rudimentary! look at the picture in the link, the spurs are huge : ). At the moment i'm reading Torsten Dikow's phylogeny of the asilidae which is probably the most comprihensive study to date.
Link: http://www.sciencedirect.com/science/article/pii/S1439609209000087

He places the Molobratiini in the Dasypogoninae as a tribe.

Cutting a corner.....

The split was made in the past based on the lack of spines on the ovipositor and the shape of sternite 8 by Lehr.

See page 103 Dikow. His study shows that Molobratia (Molobratiini as a tribe) is "positioned deeply in the Dasypogoninae".