The full-grown caterpillar is bluish-grey, dotted with glossy black warts, from each of which there is a short blackish hair. The lines along the back and sides are yellow, or white spotted with yellow. Head yellowish, dotted with black, and hairy. August and September. It feeds on garden as well as wild mignonette (Reseda).
The chrysalis is at first similar in colour to the caterpillar, but it afterwards becomes whitish. It has numerous black dots, and is marked with yellow along the sides and on the back of the thorax.
The above descriptions are abridged from Buckler's more detailed account of the life-history of this species. Of the caterpillars resulting from thirty-three eggs, only two attained the chrysalis state, in September. One of these turned black and died in November, and from the other a butterfly emerged in the following June. The figures of caterpillar and chrysalis on Plate [12] are from Buckler's "Larvæ."
Pl. 12.
Bath White Butterfly.
Caterpillar and chrysalis (after Buckler).