Syrphidae literature

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We found 2 records. keyword "Chrysotoxum verralli" and ordered by year

van der Goot (1968): Chrysotoxum verralli Collin (Diptera, Syrphidae) in Czechoslovakia - Zgravy Ceskosl. Spol. Ent. CVAV 4(3-4), 45-46
Heese, W. (1970): Zur Unterscheidung und zum Vorkommen von Chrysotoxum octomaculatum Curtis und Chrysotoxum verralli Collin (Diptera, Syrphidae) - Ent.Nachr. 14(4), 57-59