Orchestes quercus

A small weevil of just over 3.5 mm in length, it is chestnut brown coloured and hairy.  The larva mine the leaves of various oak species causing a leafmine. There is an oviposition scar in the midrib. The first part of the corridor follows the midrib, then runs towards leaf margin where it widens into a blotch. Frass in short threads attached to upper epidermis.

Adult Leafmine

Adult: Unless identified by a recognised expert, photographic evidence is required and the specimen should be examined with a microscope. In the comments box, state the key or ID method used. Note the beetle's size and describe the identifying characters. It is advisable to retain the specimen in case further checks are needed.

Leafmine: Unless identified by a recognised expert, photos are required showing the mine (preferably backlit to show frass) and oviposition scar.

Areas where Oak is present.

Mainly April to October.

Widespread in Britain, particularly in central England and Wales.

Fairly frequent in Leicestershire and Rutland, but with fewer recent records.

http://www.leafmines.co.uk/html/Coleoptera/o.quercus.htm

https://bladmineerders.nl/parasites/animalia/arthropoda/insecta/coleoptera/polyphaga/cucujiformia/curculionoidea/curculionidae/curculioninae/rhamphinini/orchestes/orchestes-quercus/