Fluke. 1933. Revision of the syrphus flies of America north of Mexico (Diptera, Syrphidae, syrphus s.l.). Transactions of the Wisconsin Academy of Science, Arts and Letters. 1: 63-127.
Fluke. 1933. Revision of the syrphus flies of America north of Mexico (Diptera, Syrphidae, syrphus s.l.). Transactions of the Wisconsin Academy of Science, Arts and Letters. 1: 63-127.