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Sorry, very late answer:

There is - so far as we know - only one Erax species in Germany. (compare: http://www.asilidae.de/modules/general_comments/speckonz.htm). It should be the same as the dutch species. Using Weinberg & Bächli (1995) German specimens run to Erax punctipennis, according to the genitalia, but we are so far not convinced that the characters used in this key are defined well enough.
The drawings of the male genitalia in lateral view are of bad quality and in the case of "barbatus" it does not fit very well with the corresponding drawing in dorsal view.
The length of the ovipositor in relation to the three last segments is no good character, too, because the length of these segments depends on various factors, both in living and in collection specimens.
Further investigations are necessary. We use the name "barbatus" just because of traditional reasons as long as the problem is not solved in a satisfying way.

Greetings, Danny