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Bringing this old thread back, because reading von Tschirnhaus' description (linked above) - shouldn't this fly be C. strigulus?

Aristal base is black (should be yellowish-brown in frontosus)
Tergites laterally not yellow (yellow-black stripe in frontosus)
Femora dark with yellow knees (yellow with black stripes in frontosus)

I am bringing this up mainly because this photo has been added to gallery, labelled as C. frontosus