Lepidoptera The Chalk-hill Blue Butterfly – Lycana Corydon
The male of this species (
The difficulty of identification is increased by the fact that both these butterflies frequent similar localities, and are often on the wing at the same time; but although Corydon is certainly a frequenter of chalky districts, yet it is often found plentifully in districts far removed from the chalk, notably at Arnside in Lancashire, and in Epping Forest.
The butterfly is out in June and July. The caterpillar is green, with two rows of short yellow streaks on the back, and a yellow stripe on each side. It feeds on the purple and Dutch clovers (Trifolium pratense and T. repens), bird’s-foot trefoil (Lotus corniculatus), horse-shoe vetch (Hippocrepis comosa), and lady’s fingers (Anthyllis vulneraria).