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Agromyza atra Meigen, 1830. Syst. Beschr. 6: 178
Cerodontha (Poemyza) atra (Meigen, 1830); Nowakowski, 1962. Annls zool., Warsz. 20: 123
Cerodontha (Poemyza) atra (Meigen, 1830); Nowakowski, 1967. Polskie Pismo ent. 37: 646
Cerodontha (Poemyza) atra (Meigen, 1830); Nowakowski, 1972. Polskie Pismo ent. 42(4): 743
Cerodontha atra (Meigen, 1830); Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 103 (fig. 353), 104
Cerodontha (Poemyza) atra (Meigen, 1830); Spencer, 1976. Fauna ent. Scand. 5(1): 188-9, fig. 330
Cerodontha (Poemyza) atra (Meigen, 1830); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 354, 367, 368 (fig. 1376).

Leaf-mine: Lower-surface corridor in the top half the leaf blade; the mine changes direction at least two times. One to three larvae in a mine. Frass in rather regular granules (Bladmineerders van Europa).

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.

The larva is described by Nowakowski (1973). The description of the larva by de Meijere (1925a) is based on material from Phragmites, and therefore refers to C. phragmitidis (Bladmineerders van Europa).

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).

The puparium is described by Nowakowski (1973). Pupation mostly outside the mine (Bladmineerders van Europa).

Hosts in Great Britain and Ireland:

Hosts elsewhere:

Poaceae
Agrostis				Spencer, 1990: 357
Agrostis	stolonifera	Creeping Bent		Spencer, 1976: 188
Agrostis	stolonifera	Creeping Bent		Bladmineerders van Europa
Calamagrostis				Spencer, 1990: 354
Calamagrostis	epigejos	Wood Small-reed		Spencer, 1976: 188
Calamagrostis	epigejos	Wood Small-reed		Bladmineerders van Europa
Dactylis				Pitkin & Plant
Dactylis				Robbins, 1991

Time of year - mines: July-August (Bladmineerders van Europa).

Time of year - adults: May, August.

Distribution in Great Britain and Ireland: Probably widespread at least in southern England. Records include Kent (Otford), Surrey (Box Hill) (Spencer, 1972b: 104), Cambridgeshire, Dorset, Glamorgan, North Hampshire, North Somerset and South-west Yorkshire (NBN Atlas).

Distribution elsewhere: Widespread and common in continental Europe including Denmark, Sweden, Finland (Spencer, 1976: 188), Belgium (Scheirs, de Bruyn and von Tschirnhaus, 1995), Germany (Spencer, 1976: 554), Austria, Belarus, Corsica, Czech Republic, Estonia, French mainland, Hungary, Italian mainland, Latvia, Lithuania, Poland, Romania, Slovakia, Switzerland and Yugoslavia (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: