Entomology
Dohrn was initially interested in Hemiptera. In 1859, he published Beitrag zur Kennitss der Harpactoridae in Entomologische Zeitung and the more important Catalogus hemipterorum. He gained his doctorate from Breslau in November 1865 with his thesis “On the Anatomy of Hemiptera". At this time, he became associated with the English scientific establishment through his father's friendship with Henry Tibbats Stainton. In 1866, he published a paper on fossil insects Zur Kenntniss der Insecten in den Primärformationen. In this he describes Eugereon boeckingi (Palaeodictyoptera).
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