Common now and .again in Britain, then suddenly disappears. It is a satiny-white moth, with a dusky spot on each hind wing about 1 to 1 1/4 in. across the wings. The white abdomen in both sexes has a deep golden-brown tail, which in the female forms a dense pad.

The moths appear in August, lay their ova in a long mass on the leaves, covered with the brown tail hairs. The ova hatch in autumn, and the young larvae form a small tent of grey silk, in which they remain all. the winter, the tent being attached to a shoot or branch. In spring and summer the tents are enlarged, and in July and August the caterpillars spread out and spin their cocoons amongst the foliage, etc. The caterpillars are hairy, brown, with two red spots on the backs of segments 11 and 12 (which can be protruded), and a double red median line and white lateral spots.

This pest is notifiable to the Board of Agriculture. It does much damage in America, into which country it has been introduced.


Winter tents should be burnt. Spraying with arsenate of lead will soon destroy the larvae.