Chestnut Heath

C. glycerion is a small orange-brown butterfly, similar in size to a small heath but with distinct eye-spots (ocelli) on its hindwing. The hindwing has several ocelli on the underside, often five or six. Beyond the middle are two large irregular white sinuous patches, either separate or thinly connected. The underside of the forewing is meanwhile either entirely without ocelli, or has a small, pale, ocellus near the tip of the wing. There is some variation between sexes: the disc of the forewing of the male on the upperside is washed with copper-brown, while that of the female is yellowish brown, in varying shades. The hindwing is uniformly blackish brown. The Larva is dull green with a blue-green head, a dark dorsal stripe, a pale lateral one, as well as a red anal fork; the spiracles yellowish red. The pupa is green with white-spotted abdomen and dark-edged wing-cases.

C. glycerion is found throughout Central and a large part of Northern Europe, as well as in North and Central Asia.

The larvae feed on various grasses, and can be found on them through spring until May. The adult butterflies fly in one generation from June to August.