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Another species? Maybe yes, maybe no. First, the top one is a male (eye close-set) and the bottom one is a female (eyes widely separated). Second, there is a considereable variety in the colouration of species. They are all metallic green with many variations in lustre, either with bluish or purplish shine, etc. Robineau-Desvoidy almost made a living out describing all colour varieties as new species. In the Catalogue of Palaearctic Diptera some species have more than two pages of synonyms, all described by Robineau-Desvoidy from "l'environs de Paris"... :o