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Leaf-miner: Flat green corridors in the leaves. The only character to separate this species from Hydrellia griseola is that adult flies of griseola are dusted greyish-white, those of thoracica not dusted, greyish brown (Hering, 1957) -

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).

Comments: Irwin and Chandler in Chandler (1978) did not indicate whether their host record was British or Foreign and is therefore included under 'Hosts in Britain' and 'Hosts elsewhere', as is the record by Pitkin & Plant, which was previously assumed to be British.

Hosts in Great Britain and Ireland:

Poaceae
? Glyceria				Pitkin & Plant
? Glyceria	maxima	Reed Sweet-grass		Irwin and Chandler in Chandler, 1978: 225

Hosts elsewhere:

Poaceae
? Glyceria				Pitkin & Plant
? Glyceria	maxima	Reed Sweet-grass		Irwin and Chandler in Chandler, 1978: 225
Glyceria	fluitans	Floating Sweet-grass		Bladmineerders van Europa

Time of year - mines: April (Hering, 1957).

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Widespread in Britain including Cambridgeshire, Dorset, East Kent, East Norfolk, Leicester, Monmouthshire, North Somerset, Nottinghamshire, South Wiltshire, South-west Yorkshire, Surrey, West Lancashire, West Suffolk and Westmorland (NBN Atlas).

Also recorded in the Republic of Ireland (Zatwarnicki, 2004 in Fauna Europaea).

Distribution elsewhere: North and Central Europe including The Netherlands (Bladmineerders van Europa), Belgium (Gosseries, 1991d), Austria, Bulgaria, Czech Republic, Finland, French mainland, Germany, Hungary, Italian mainland, Poland, Romania, Slovakia, Sweden, Switzerland and The Netherlands (Zatwarnicki, 2004 in Fauna Europaea).

NBN Atlas links to known host species:

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