Scrolling through the gallery and other sources, I find inconsistencies concerning the wing pattern (homogeneous darkening versus marginal darkening also in C. obscuripennis), compare http://www.fugleo...;ID=344794 versus http://www.dipter...to_id=5403 ff. Nevertheless I favour C. punctum, as it has a yellow face and antennal base, whereas in C. obscuripennis it is all dark (http://www.dipter...d_id=63583).