Citations: Anonym 1921: [Howlett, F. M.] Entomological News and Proceedings of the Entomological Section of the Academy of Natural Sciences of Philadelphia, Philadelphia 32, S. 64, B15 10004
Scott, H. 1920: [Howlett, F. M.] The Entomologist's Monthly Magazine, Third Series, London 56, S. 234, 262, B15 10006