Richard South, The Moths of the British Isles… (1920)
“ During the daytime it resides in a leaf neatly folded in half; when quite young, the caterpillar then being blackish, a small leaf or just the turned-over edge of a large one answers its purpose. The chrysalis is reddish, enclosed in a flimsy cocoon among leaves, moss, or roots of grass, etc., sometimes just under the surface of the soil. The early stages are figured on Plate 38, Figs. 2-2c. The moth emerges in March or April of the year following pupation, as a rule, but it may remain in the chrysalis for two winters. ”
