S. W.  Williston, ?New or little known genera of North American Syrphidae?, The Canadian Entomologist, vol. 14, pp. 77-80, 1882.

S. W.  Williston, ?Contribution to a monograph of the North American Syrphidae?, Proceedings of the American Philosophical Society, vol. 20, pp. 299-332, 1882.

S. W.  Williston, ?Fam. Syrphidae [conc.]; Fam. Conopidae; Fam. Pipunculidae?, in Biologia Centrali Americana, Zoologia - Insecta - Diptera, vol. 3, F. D.  Godman and Salvin, O., Eds. London: , 1892, pp. pp. 52-72, 73-79, pl. 1, pl. 2, figs. 1-12; pp. 79-86, pl. 2, figs. 13-14; pp. 86-88.

S. W.  Williston, ?Fam. Syrphidae?, in Biologia Centrali Americana, Zoologia - Insecta - Diptera, vol. 3, F. D.  Godman and Salvin, O., Eds. London: , 1891, pp. 1-56; 57-72; 73-78, pl. 1, 2, figs. 1-12.

S. W.  Williston, ?Diptera Brasiliana, ab H. H. Smith collecta. Part I, Stratiomyidae, Syrphidae?, Transactions of the Entomological Society of America, vol. 15, pp. 243-292, 1888.

S. W.  Williston, ?Synopsis of the North American Syrphidae?, Bulletin of the United States National Museum, vol. 31, pp. i-xxx, 1-335, 1886.

S. W.  Williston, ?Eine merkwurdige neue Syrphiden-Gattung?, Wiener entomologische Zeitung, vol. 3, pp. 185-186, 1884.