British Insects: the Genus Phyllonorycter (Lepidoptera-Gracillariidae)
Associated with trees. On Betulaceae; Betula spp..
Larvae. The larvae mining in leaves; in the under-side. Found in July, or September to October.
Adults. Antennae white to the base (lightly ringed greyish). Face white. Head white and fuscous. Thorax golden ochreous.
Wing-span 8–10 mm. Forewings clear golden ochreous; with a well defined basal streak (this narrow, traversing about a third of the wing). The basal streak pale; straight, neither markedly long and slender nor sinuate; not dark-edged above. Forewings with well defined pale strigulae (white). Costal strigulae 4. The first costal strigula not basipetally extended along the costa. Dorsal strigulae 3. Forewings with the first costal strigula approaching a dorsal one at an acute angle; with one transverse pale fascia (via confluence of the first pair of strigulae), or without transverse pale fasciae. The fascia (or the interrupted fascia) angulated. Hindwing cilia light fuscous (slightly golden).
Adults abroad May and August.
Illustrations. • Phyllonorycter species on Birch.
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Cite this publication as: ‘Watson, L., and Dallwitz, M.J. 2003 onwards. British insects: the genus Phyllonorycter (Lepidoptera-Gracillariidae). Version: 29th December 2011. http://delta-intkey.com’.