Caloptilia populetorum
Caloptilia populetorum (commonly known as clouded slender) is a moth of the family Gracillariidae. It is found in most of Europe, except Italy, the Balkan Peninsula and the Mediterranean islands. The wingspan is . The forewings are whitish ochreous, irregularly tinged and clouded with fuscous; margins dotted with black; a small black spot on middle of costa blackish dots on fold at 1/3 and 2/3. Hindwings are dark grey. The larva is green-whitish; head very pale brownish. Adults are on wing from August onwards, overwintering after which they may be seen until April or May. Although the scientific name populetorum might suggest the larvae feed on poplar, they only feed on the leaves of Betula species, including Betula pendula and Betula pubescens. Initially they feed in a gallery and later they roll a leaf and feed within. References

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Leafminers and plant galls of Europe
UK Moths

populetorum
Moths of Europe
Moths described in 1839