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Agromyza erythrocephala Hendel, 1920. Arch. Naturgesch. 84A(7)(1918): 117
Agromyza erythrocephala Hendel, 1920; Hendel, 1931. Fliegen palaearkt. Reg. 6(2): 115
Agromyza erythrocephala Hendel, 1920; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 31, 40 (fig. 121), 42, 118
Agromyza erythrocephala Hendel, 1920; Spencer, 1976. Fauna ent. Scand. 5(1): 104-6, figs 158-163.
Agromyza erythrocephala Hendel, 1920; Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 112, 127, 128 (figs 459-60).

Gall-former: Larva forming an elongated stem-gall up to 2 cm in length. Pupation external (Spencer, 1972b: 42; Spencer, 1976: 105).

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.

Larval mandibles with two teeth; the anterior and posterior spiracles are illustrated by Spencer (1976: 105, figs 161-2).

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).

Dark brown; anterior spiracles each with up to 35 bulbs (Spencer, 1976: 105); posterior spiracles each having up to 40 bulbs (Spencer, 1976: 105).

Hosts in Great Britain and Ireland:

Fabaceae
Vicia	cracca	Tufted Vetch		Spencer, 1972b: 118
Vicia	cracca	Tufted Vetch		Redfern et al., 2002

Hosts elsewhere:

Fabaceae
Vicia				Spencer, 1976: 104
Vicia				Spencer, 1990: 112
Vicia	cracca	Tufted Vetch		Spencer, 1976: 104
Vicia	dumetorum			Spencer, 1976: 104
Vicia	sepium	Bush Vetch		Spencer, 1976: 104
Vicia	silvatica	Wood Vetch		Spencer, 1976: 104
Vicia	tenuifolia	Fine-leaved Vetch		Spencer, 1976: 104

Time of year - galls: July.

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Huntingdonshire (Woodwalton Fen) (Spencer, 1972b: 42).

Distribution elsewhere: Widespread in continental Europe including Germany (Spencer, 1972b: 42), Sweden (Spencer, 1976: 103), Austria, Czech Republic, Finland and Poland (Fauna Europaea).

NBN Atlas links to known host species:

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