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Dizygomyza scirpi Karl, 1926. Stettin. ent. Ztg. 87: 137
Cerodontha (Butomyza) scirpi (Karl, 1926); Nowakowski, 1967. Polskie Pismo ent. 37: 638
Cerodontha (Butomyza) scirpi (Karl, 1926); Nowakowski, 1972. Polskie Pismo ent. 42(4): 751
Cerodontha (Butomyza) scirpi (Karl, 1926); Spencer 1972b. Handbk. ident. Br. Ins.: 100
Cerodontha (Butomyza) scirpi (Karl, 1926); Spencer, 1976. Fauna ent. Scand. 5(1): 209, figs 361-2
Cerodontha (Butomyza) scirpi (Karl, 1926); Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 349, 350 (fig. 1322), 351, 380.

Leaf-miner: A very long mine. Pupation at base of leaf (Spencer, 1972b: 100).

Very long upper-surface corridor, at the end about 1/3 of the width of the leaf. The mine usually begins about halfway along the blade and descends within the leaf sheath. Just before pupation all frass is deposited in one big mass. Puparium within the mine, where it also passes the winter (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 (1928 and 1937), Dempewolf (2001: 111) and Nowakowski (1973). Anterior spiracles very large, bifid, with 24-30 papillae. Posterior spiracles large as well, with 3 hook-like bulbs. Body yellow.

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).

Brown, rather flat (Spencer, 1972b: 100).

Hosts in Great Britain and Ireland:

Hosts elsewhere:

Time of year - mines: Currently unknown.

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Probably widespread. Surrey (Godalming) (Spencer, 1972b: 100) and Cambridgeshire and Stafford (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Denmark, Finland, Norway, Sweden (Spencer, 1976: 209), Germany (Spencer, 1976: 554; Dempewolf, 2001: 111), Bulgaria, Czech Republic, Hungary, Lithuania, Poland and Slovakia (Fauna Europaea).

Also recorded in Canada (Spencer, 1969a: 123).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: