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Antispila treitschkiella (Fischer von Röslerstamm, 1843) and A. petryi Martini, 1899, sp. rev. were regarded as synonymous since 1978, but are shown to be two clearly separated species with different hostplants, life histories, DNA barcodes and morphology. Antispila treitschkiella feeds on Cornus mas L., is bivoltine, and has, by following its ornamentally planted host, greatly expanded its range in north-western Europe. In contrast A. petryi feeds on the widespread native C. sanguinea L., is univoltine, and is one of only two Antispila species previously resident in the British Isles, the Netherlands and northern Europe. Consequently, the increase in abundance of A. treitschkiella in the Netherlands since the early 1990s and in Great Britain in recent years must be regarded as part of a recent expansion into north-western Europe, whereas the native A. petryi is hardly expanding and less abundant. In Britain, detailed surveys of parks and living collections confirmed the monophagy of these two species. A search of British herbarium samples provided no evidence for an earlier date of establishment. Information on recognition of all stages, including DNA barcodes, and distribution is provided, and these two species are compared with the third European Cornus L. leafminer, A. metallella (Denis & Schiffermüller, 1775).

The genus Gielisella gen. n., belonging to the Elachistidae: Parametriotinae is described with two new species from southern Spain: its type species G. clarkeorum sp. n. and G. nigripalpis sp. n., both only known from adults collected at light. DNA barcodes of both species are provided. The taxonomic history of the Parametriotinae is discussed and a catalogue of the 35 recognised genera is provided as appendix. The arguments for erecting a new genus are discussed and we hypothesize that this constitutes an overlooked native Palaearctic element, although we cannot completely rule out the possibility of imported exotic species.