As this is consistent both with the career progression of young theologians at the time who often worked as teachers before their first appointment and with Fischer's records it seems safe to assume that this was indeed the lepidopterist Johann Siegfried Hufnagel.
Between 1765 and 1767 Hufnagel published thirteen papers on Lepidoptera (moths and butterflies), ten of them during 1766, and all in the journal "Berlinisches Magazin, oder gesammlete [sic] Schriften und Nachrichten für die Liebhaber der Arzneywissenschaft, Naturgeschichte und der angenehmen Wissenschaften überhaupt", one of the learned journals covering a wide range of aspects in the fields of natural history and medicine which had been founded during the 18th century.
One of his papers was devoted to agricultural pests, four contained descriptions of single species treated in some detail and accompanied by illustrations.
A further impediment is Hufnagel's lack of a terminology for the wing pattern elements of Lepidoptera which makes his descriptions difficult to interpret even for native speakers of German.
By the mid-1770s Hufnagel had become acquainted with Freiherr S. A. von Rottemburg who lived in Klemzig near Züllichau (then Neumark, today Poland).
It was not until 1844 when Philipp Christoph Zeller published an analysis of Hufnagel's work identifying many species that the names became known to a wider circle of lepidopterists and eventually began to gain acceptance.