About Colias myrmidone (Esper, 1781)
Colias myrmidone (Esper, 1781) has a wingspan ranging from 44–50 mm (1.7–2.0 in). Butterflies from the second generation are often slightly larger than those from the first generation. On males, the upper surface of the wings has a bright orange-yellow base color, with an undusted dark edge. The dark border is narrower on the hindwings, and is not broken by veins, which distinguishes it from Colias crocea. On females, the upper wing surface ranges in color from orange-yellow to greenish-white (this greenish-white form is called C. myrmidone f. alba), and has a dark, dusty border. On the hindwings, spots in the submarginal region often form a continuous band. In both sexes, there is a red spot in the cell on the underside of the hindwing, while the underside of the forewing has faint black spots in the postdiscal region. This species is distributed from Western Asia, through Southern Russia, Ukraine, Romania, Hungary, up to Austria and the Jura Mountains near Regensburg in Germany.
