Val, F. C. do. On the Biometyry and Evolution of the Genus Ornidia (Diptera, Syrphidae). Pap. Avulsos Zool. 1972, 26 (1-24 (1972-1973), 1-28. https://doi.org/10.11606/0031-1049.1972.26.p1-28.