Betula pubescens, Bergen NH
Betula, Bergen NH: living larva; dorsal; © John van Roosmalen
Larvae without prolegs; base (coxa) of the thoracic feet with 3 spines (character of Profenusa) Body whitish with pale brown head and feet; pronotum colourless. See for more details of the larva Lindquist (1959a), Lorenz & Kraus (1957a), Watson (1959a) and Smith (1971a), and for the biology Martin (1960a).
The prepupa is bone-coloured with very pale brown head and feet, and a black ocellus.