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December Moth - Poecilocampa populi - Larvae. Length 17-19mm. A sombre-looking moth with a hairy body. Adult has dusky-brown wings, with buff and reddish outer margins and pale cross lines. The body is hairy; front of head is whitish. Male is smaller than female. Flies mainly November-December. Larva feeds on a range of deciduous trees. Widespread and common across much of Britain.