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Agromyza capitata Zetterstedt, 1848. Dipt. Scand. 7: 2750
Cerodontha (Icteromyza) capitata (Zetterstedt, 1848); Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 105 (fig. 356), 106
Cerodontha (Icteromyza) capitata (Zetterstedt, 1848); Spencer, 1976. Fauna ent. Scand. 5(1): 171-2, figs 308-9
Cerodontha (Icteromyza) capitata (Zetterstedt, 1848); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 345, 346 (fig. 1300), 351.

Stem-borer: Feeds in the stems and pupariates at base (Spencer, 1976: 172).

Larva: The larvae of flies are leg-less maggots without a head capsule (see examples). They never have thoracic or abdominal legs. They do not have chewing mouthparts, although they do have a characteristic cephalo-pharyngeal skeleton (see examples), usually visible internally through the body wall.

Puparium: The puparia of flies are formed within the hardened last larval skin or puparium and as a result sheaths enclosing head appendages, wings and legs are not visible externally (see examples).

Hosts in Great Britain and Ireland: Currently unknown possibly Juncus, but this requires confirmation (Spencer, 1972b: 106).

Hosts elsewhere:

Time of year - larvae: Currently unknown.

Time of year - adults: June-August.

Distribution in Great Britain and Ireland: Widespread in Britain including Oxford (Eynsham), Hertfordshire (Welwyn), Dorset, Somerset, Cornwall (St Boswell's), Derby (Goyt Valley), Cumberland (Grasmere, White Moss), Aberdeen (Den of Pitlurg) and Elgin (Culbin Sandhills) (Spencer, 1972b: 106); Ayrshire, Cambridgeshire, Cardiganshire, Derbyshire, Dorset, Dumfriesshire, East Kent, Glamorgan, Herefordshire, Huntingdonshire, Monmouthshire, Montgomeryshire, North Somerset, Nottinghamshire, Pembrokeshire, Radnorshire, Renfrewshire, South Aberdeenshire, South Northumberland, South-west Yorkshire, Surrey, West Cornwall, West Lancashire, West Norfolk and Westmorland (NBN Atlas).

Also recorded in the Republic of Ireland: Co. Cork (Tober Ghobnatan) and Co. Kerry (Kilarney) (Spencer, 1972b: 106).

Distribution elsewhere: Widespread in continental Europe including Denmark, Finland, Sweden (Spencer, 1976: 172), Germany (Spencer, 1976: 550), Austria, Czech Republic, Estonia, French mainland, Hungary, Latvia, Lithuania, Poland, Slovakia, Spanish mainland, The Netherlands, Switzerland and Yugoslavia (Fauna Europaea).

Also widespread in northern U.S.A. and Canada (Spencer, 1969a: 138).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: Currently unknown.