Cepa alex (Thompson, 1999).
Thompson, F.C. (1999) A key to the genera of the flower flies (Diptera: Syrphidae) of the Neotropical Region including descriptions of new genera and species and a glossary of taxonomic terms. Contributions on Entomology, International 3, 321-378. [1999.08.23]
Species known from Brazil (Santa Catarina) and Paraguay (Thompson 2010).