Massive, black body; sometimes the sides of the abdomen in the female are reddish. Tergites 3 and 4 (at least) in the female covered with light, yellow, white and grey hairs. Forewings transparent, darkened especially at the tips. Thighs black, shins and feet orange-brown. Last segment of antennae club-shaped. Larva white-green, yellow-green or blue-green, wrinkled transversely, without coloured pattern.
It can be found mainly in moist forests. The larvae feed on willows, alders and birches.
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