Pl. 83.
Wall Butterfly.
Eggs, natural size and enlarged; caterpillar and chrysalis.
Variation is chiefly in the size of the eyed spots; sometimes the apical one of the fore wings has a smaller one attached to its lower margin, or in the interspace (i.e. between the veins) above it or below it; or both extra spots, which are usually without white pupils, may be present. Very rarely the apical spot may be almost absent on one fore wing, but well defined on the other. The central transverse lines on the fore wings of the female are sometimes broad, and very occasionally the space between the lines is blackish; blackish-banded male specimens are also found in some localities, such as the slopes of Dartmoor, Devon, as mentioned by Barrett.
Fig. 26.