155570 Northern Brown Argus Aricia artaxerxes Wingspan 25mm. A distinctive butterfly and the northern counterpart of the Brown Argus. Adult has rich brown upperwings and orange submarginal spots; compared to Brown Argus note the white spot on the upper forewing. Underwings are grey-brown with white-ringed black spots, and orange submarginal spots. Flies June-July. Larva is grub-like and feeds on Common Rock-rose. Very local in calcareous grassland in northern England and Scotland.