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Cerodontha bimaculata (Meigen, 1830)
[Diptera: Agromyzidae]

Agromyza bimaculata Meigen, 1830. Syst. Beschr. 6: 172
Cerodontha (Dizygomyza) bimaculata (Meigen, 1830); Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 101
Cerodontha (Dizygomyza) bimaculata (Meigen, 1830); Spencer, 1976. Fauna ent. Scand. 5(1): 213-4, figs 368-9.
Cerodontha (Dizygomyza) bimaculata (Meigen, 1830); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 345, 346 (fig. 1307), 351.

Leaf-mine: Long, rather narrow corridor, upper-surface or interparenchymatous mine. The mine changes direction one or two times. Often the corridor ends in the leaf sheath. Frass in one or two large lumps. Puparium in the lower part of the mine. Hibernation in the puparial state (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 de Meijere (1925) and Nowakowski (1973). Posterior spiracleswith three strongly elongated bulbs that stand out at a right angle, not unlike a hen's toes (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).

Elongate, not deeply segmented. Posterior spiracles each with 3 finger-like bulbs (Spencer, 1976: 214).

Hosts in Great Britain and Ireland:

Juncaceae
Luzula				Robbins, 1991: 128
Luzula	multiflora	Heath Wood-rush		Spencer, 1972b: 125
Luzula	pilosa	Hairy Wood-rush		Spencer, 1972b: 125

Hosts elsewhere:

Juncaceae
Luzula				Spencer, 1976: 214
Luzula				Spencer, 1990: 345
Luzula	campestris	Field Wood-rush		Bladmineerders van Europa
Luzula	multiflora	Heath Wood-rush		Bladmineerders van Europa
Luzula	pilosa	Hairy Wood-rush		Bladmineerders van Europa
Luzula	pilosa	Hairy Wood-rush		Spencer, 1990: 345
Luzula	sylvatica	Great Wood-rush		Bladmineerders van Europa

Time of year - mines: July-October, rarely November (Bladmineerders van Europa).

Time of year - adults: May - September.

Distribution in Great Britain and Ireland: Widespread in Britain including Kent (Hayes Common), Surrey (Colley Hill), Middlesex (Scratch Wood), Hampshire (New Forest), Suffolk (Woodditton Wood), Huntingdonshire (Woodwalton Fen), Hereford (Tarrington), Westmorland (Newby), Yorkshire (Malham Tarn), Banff (Loch Oark) and Inverness (Aviemore) (Spencer, 1972b: 101) and East Kent, Easterness, Glamorgan, Monmouthshire, North Devon, North Somerset, North-east Yorkshire, South-west Yorkshire, Stafford and West Norfolk (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe, including Denmark, Sweden, Norway (Spencer, 1976: 214), The Netherlands (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991), Germany (Spencer, 1976: 554), Austria, Czech Republic, Estonia, Finland, Hungary, Italian mainland, Latvia, Lithuania, Poland, Romania, Slovakia, Spanish mainland and Vatican City (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: