Mecyna flavalis ([Denis & Schiffermüller], 1775)
63.0390 (B&F: 1396)
A resident and suspected occasional immigrant species, in danger of extinction in the East and presumed extinct in the West since 1918. As a native it is often common and sometimes very common by day at its only known colony on the Downs at Wilmington. As a suspected immigrant it is rare in both vice-counties. Single-brooded, flying mainly from mid-July to late August. The larval foodplant is not known in this country. (Pratt, 2011).