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 shining white to the base (ringed fuscous). Face white. Head orange, or fuscous. Thorax orange, or brown.
Wing-span 5–7 mm. Forewings shining golden brownish orange, or golden brown; not clear shining white; with a well defined basal streak. The basal streak fuscous on the light background; straight, neither markedly long and slender nor sinuate (traversing about a third of the wing and sometimes reaching the white fascia); not dark-edged above (but dark-margined below, towards the apex). Forewings with well defined pale strigulae (shining white). Costal strigulae 4. Dorsal strigulae 3. Forewings with the first costal strigula not forming an acute angle with a dorsal one; with one transverse pale fascia (via coalescence of the first pair of strigulae, which are unrecognisable as discrete entities). The fascia angulated. Hindwing cilia whitish fuscous.
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’.