[For full-size image, click here...then click the resulting image in your browser window once more.]

This image shows (albeit "fuzzily") two key characters from couplet 2a in the key to world genera of Chauliodinae:

    i) "Posterior branch of M (= medial vein complex) simple"
    ii) "Thoracic vestiture short and sparse"

I placed two hot pink dots at the two forks on the medial vein (complex) "M". The first dot (at first fork) indicates the point where the anterior and posterior branches of the medial vein "M" separate. Note the anterior branch is forked again (at the second pink dot), but the posterior branch is not. The 3 arrows indicate the approximate spots on the wing margin where the terminal segments of the medial vein (complex) meet the wing margin.

For more info on this post, please see remarks under 1st image in series.