From 1925 Kotzsch owned the entomological dealership "Hermann Wernicke" in Dresden.
From here he sold insects collected on his many collecting trips (Rybachy Peninsula (1933), Armenia (1934), Hindu Kush (1936), Iran and Afghanistan (1939) Turkey and China.
Like most dealers of his time Kotzsch described many new subspecies of "exotic" butterflies, particularly from South America.
Most are these are unsound but his taxonomic work on Palaearctic fauna is much better.
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