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http://www.landes...1-0257.pdf

There may be an illustration in Mannheims paper, but I do not have a reprint or pdf:
Mannheims , B.J., 1935, Beitrage zur Biologie und Morphologie der Blepharoceriden (Dipt.). - Zoologische Forschungen 2: 1-115, 69 pls.