Betula, Vennebroek © Kees Boele
Betula, Belgium, prov. Hainaut, Mouscron, Kleiputten van de Sterreberg © Christophe Gruwier
Betula pendula, Hollandsche Rading: head and pronotum, dorsally and ventrally
Betula pendula, Castricum; head and thorax, dorsal
Betula pendula, Denmark © Simon Haarder: larva in the mine, with exuvium
the larva, dissected out
The frontal part of the head capsule is moderately chitinised, brown; the rear lateral extensions however, are strongly sclerotised. Because the head for its largest part normally is retracted into the semitransparant prothorax, this gives the impression of a pair of vague black pronotal spots. Abdomen segment 1 has a pair of short lateral extensions (Hering, 1957a). Often they are hardly visible.
Like the lower two pictures prove, the young larva has dark spots ventrally on the thorax and first abdominal segment, like it is the case in Eriocrania semipurpurella.