Lepidoptera The Black Arches Moth – Psilura Monacha
The fore wings of the Black Arches are white, marked with zigzag black lines as shown in our illustration. The hind wings are smoky grey. The hinder segments of the abdomen are banded with black and rose-pink. The male is much smaller than the female, and has the antenna strongly pectinated.
The caterpillar is hairy, and of a greyish-white colour. A brown stripe runs down the back. On the top of the second segment are two blue tubercles; and there is also a tubercle, of a reddish colour, on each of the ninth, tenth, and eleventh segments. It feeds on the oak, birch, fir, and the apple; and is full grown in June or July.
The moth flies during July and August.