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Agromyza igniceps Hendel, 1920. Arch. Naturgesch. 84A(7)(1918): 122
Agromyza igniceps Hendel, 1920; Hendel, 1931. Fliegen palaearkt. Reg. 6(2): 124
Agromyza humuli Hering, 1924b. Zeitschrift für Morphologie und Ökologie der Tiere. 2: 235
Agromyza igniceps Hendel, 1920; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 35, 110
Agromyza igniceps Hendel, 1920; Spencer, 1976. Fauna ent. Scand. 5(1): 114-115, figs 184-6.
Agromyza igniceps Hendel, 1920; Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 53, 55, 56 (fig. 204).

Leaf-miner: A linear leaf-mine, widening irregularly; frass in two conspicuous black strips (Spencer, 1972b: 35, fig. 186).

Long, narrow, little widening corridor, often following a vein for a considerable distance. The thin leaves easily tear here, also because the mine is relatively deep. Frass in two neat rows of grains along the sides. Pupation outside the mine; unlike A. flaviceps on the same hostplant, the exit slit is in the upper epidermis (Bladmineerders van Europa).

A short, irregular narrow gallery. Frass in conspicuous black stripes (British leafminers).

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 white larva is described by de Meijere (1925) and in Bladmineerders van Europa ; posterior spiracles each with 3 bulbs on a large conical projection (Spencer, 1976: 114).

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).

Hosts in Great Britain and Ireland:

Cannabiaceae
Humulus	lupulus	Hop		Mines in BMNH
Humulus	lupulus	Hop		British leafminers
Humulus	lupulus	Hop		Spencer, 1972b: 110

Hosts elsewhere:

Cannabiaceae
Humulus				Spencer, 1990: 53
Humulus	lupulus	Hop		Bladmineerders van Europa
Humulus	lupulus	Hop		Spencer, 1976: 110

Time of year - mines: June.

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Kent (Sittingbourne) and Hampshire (Isle of Wight) (Spencer, 1972b: 35) and Shropshire (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Denmark, Finland, Norway, Sweden (Spencer, 1976: 114), The Netherlands (Bladmineerders van Europa), Germany (Spencer, 1976: 546), Austria, Czech Republic, Poland and Slovakia (Fauna Europaea).

NBN Atlas links to known host species:

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