Smit, John, 2014, Two new species of the genus Callicera Panzer (Diptera: Syrphidae) from the Palaearctic Region

Smit, John, 2014, Two new species of the genus Callicera Panzer (Diptera: Syrphidae) from the Palaearctic Region, Zootaxa 3779 (5), pp. 585-590

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