Career
From 1925 Kotzsch owned the entomological dealership "Hermann Wernicke" in Dresden. Many of his specimens are in Museum Alexander Koenig in Bonn and in Museum für Naturkunde Berlin. In 1948 two years before his death he purchased the business collection "Staudinger" - Bang-Haas from the widow of Otto Bang-Haas.
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.
