157168 Brown Argus - Aricia agestis - male (top row) - female (bottom row). Wingspan 25mm. A well-marked butterfly of grassy habitats. Adult recalls a female Common Blue but note the smaller size and that orange submarginal spots on brown upperwings are much more striking. Underwings are grey-brown with white-ringed black spots, and orange submarginal spots. Double-brooded: flies May-Aug. Larva is grub-like and feeds on Common Rock-rose and storksbills. A distinctly local species, restricted to southern and central England, and often on chalk downland.