[2] The adult is a small fritillary with typically chequered orange-brown upperside and a submarginal row of triangles and dots.

hudaki Aign.,especially plentiful among the second brood, only the narrow median band of the hindwing is reddish yellow, the margin as well as the base being broadly black.

[ now subspecies B. d. alpina] (Elwes, 1899] (68f) is the form from eastern Central Asia, described from the Altai; the ground-colour is duller, more leather-colour than reddish yellow.

— Larva paler or darker grey, with a pale-edged blackish dorsal l ine and a reddish brown side-line; subdorsally there are small light spots in a blackish patch; the spines pale yellow with dark yellow base; in June and from September till April on Violaceae and Rubus, said to feed also on Prunella vulgaris.

The butterfly in April and May and again from August onward in open places and clearings of woods, flying low and frequently visiting flowers.

[3] B. dia differs from the pearl-bordered fritillary in having a sharp angle to its hindwing (readily seen from underside when perched with wings closed).