The forewings of this species are pale to dark grey with rather indistinct markings apart from a thin black basal streak.

candelisequa Esp., to which Staudinger wrongly sinks infuscata, seems, from the figure, to be intermediate between it and the type, if it belong here at all: ab.

is the common British form, with forewing darker, tinged with ochreous, and more distinct markings; ab.

The extraordinary larva is very distinctive, thickly covered with very long yellow and orange hairs with white spots outlined in black along the back.

It feeds on various maples and also on common horse-chestnut, large-leaved lime, mulberry and pedunculate oak.