I only know this species from blown larvæ in Staudinger’s collection,
and Duponchel’s figure, of which Fig. 51, Pl. VI. is a copy. The adult
insect possesses two perfectly separated rows of ring-spots. Duponchel
figures also two younger stages, of which the youngest is probably the
third stage. The larva is 18 millimeters in length, of a leaf-green
colour, and shows no trace of a subdorsal line, but possesses the two
rows of ring-spots, which only differ from those of the succeeding
stages in the green colour of the “mirror.”