Coleophora albitarsella

Wingspan 10 to 13 mm. This grey winged moth resembles several others in the genus Coleophora, but the white tarsus on each leg (hind two pairs only on female) is conspicuous on live specimens. More reliable identification depends on examination of the genitalia, or rearing from the distinctively cased larva.

Adult leaf mine/case

larval stage: photograph the cased larva and mines on leaf; note host species in comments

In open and shady habitats where the foodplants occur.

The adult flies at night, and sometimes in sunlight, from mid June to August.

Larvae feed on various plants such as Marjoram, various mints, Ground-ivy etc.

Found throughout England and Wales and a few places in Scotland, distribution is at best local throughout and it is quite scarce further north. In the Butterfly Conservation’s Microlepidoptera Report 2011 this species was classified as local.

It appears to be uncommon in Leicestershire and Rutland, where there are few records. L&R Moth Group status = D (rare or rarely recorded).

http://www.leafmines.co.uk/html/Lepidoptera/C.albitarsella.htm

https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/lepidoptera/ditrysia/gelechioidea/coleophoridae/coleophora/coleophora-albitarsella/