Mine of Chromatomyia milii on Holcus lanatus Image: Willem Ellis (Bladmineerders van Europa)

Leaf-mine: A substantial linear mine. Pupation internal; posterior spiracles projecting through the epidermis (Spencer, 1976: 449).

Elongated, shallow, upper-surface or lower-surface blotch, not infrequently several in one leaf. Frass in strings or pearl chains. Pupation within the mine (Bladmineerders van Europa)

Larva: The larva is described by de Meijere (1926), Dempewolf (2001: 204) and illustrated in Bladmineerders van Europa.

Chromatomyia milii larva, lateral Image: Willem Ellis (Bladmineerders van Europa)

Puparium: Posterior spiracles elongated (Spencer, 1972: 95). The bifid anterior spiracles of the puparium penetrate the epidermis; the posterior spiracula are dagger-shaped, elongated and curved, and are anchored in the leaf tissue (Bladmineerders van Europa)

Chromatomyia milii larva, dorsal Image: Willem Ellis (Bladmineerders van Europa)

Hosts in Britain:

Hosts elsewhere:

Time of year - mines: July.

Time of year - adults: Unknown.

Distribution in Great Britain and Ireland: Widespread and abundant in south and in Scotland and almost certainly throughout British Isles (Spencer, 1972: 95). Records include Warwickshire (Coventry, Holbrooks) (Robbins, 1991: 141); Caernarvonshire, Cambridgeshire, Carmarthenshire, East Cornwall, East Gloucestershire, East Kent, East Norfolk, East Suffolk, East Sussex, Glamorgan, Herefordshire, Isle Of Wight, North Devon, North Somerset, Shropshire, South Somerset, South Wiltshire, South-west Yorkshire, Stafford, Surrey, West Gloucestershire, West Kent, West Norfolk, West Suffolk, West Sussex, Worcestershire (NBN Gateway - N.B. includes Watsonian Vice Counties having publicly available records that fall within or overlap the vice county border at 10km resolution or better i.e. a record for a vice county may relate to an adjacent vice county - for included datasets see NBN Grid map below).

Also recorded in the Republic of Ireland: Co. Clare, Co. Galway and Co. Mayo (Spencer, 1972: 95).

NBN Grid map: Note that not all datasets on the NBN Gateway may be available on the map below. If you are an NBN Gateway registered user you can request access for missing datasets via the link 'Open interactive map in new window' below.

Distribution elsewhere: Widespread from Morocco through central and northern Europe including Denmark, Finland, Norway, Sweden, Iceland, Faroe Is. (Spencer, 1976: 447), The Netherlands, Luxembourg (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991), Germany (Spencer, 1976: 574), Belarus, Czech Republic, Estonia, European Turkey, Iceland, Italian mainland, Latvia, Lithuania, Poland, Slovakia, Spanish mainland and Switzerland (Martinez in Fauna Europaea).

Also recorded in Canada (Spencer, 1969a: 255; Spencer, 1976: 447).

NBN interactive distribution map(s) of known host species in Great Britain and Ireland and elsewhere:

Parasitoids in Britain and elsewhere:

Biodiversity Heritage Library
Bladmineerders van Europa
British leafminers
Encyclopedia of Life
Fauna Europaea [128318]
NBN Gateway