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Agromyza alnibetulae Hendel, 1931. Fliegen palaearkt. Reg. 6(2): 101
Agromyza alnibetulae Hendel, 1931; Spencer, 1969. Beitr. Ent. 19: 6
Agromyza alnibetulae Hendel, 1931; Spencer, 1972b. Handbk ident. Br. Ins. 10(5g): 36 (figs 107-8), 39, 109
Agromyza alnibetulae Hendel, 1931; Spencer, 1976. Fauna ent. Scand. 5(1): 93, figs 129-130
Agromyza alnibetulae Hendel, 1931; Spencer, 1990. Host specialization in the world Agromyzidae (Diptera) : 54, 60 (fig. 227), 61, 100, 178.

Leaf-miner: Larva forming a narrow, unusually long, upper surface leaf-mine up to 12 cms, sometimes considerably widening at end; young leaves are frequently distorted (Spencer, 1976: 93, fig. 130).

An unusually long, upper-surface corridor that widens only little and winds freely through the leaf. Frass in two neat rows. Pupation outside the mine; exit slit (always?) in the lower epidermis (Bladmineerders van Europa).

A long, greenish, winding, upper surface gallery which sometimes broadens considerably at the end (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.

Yellow. Anterior spiracles each with 10 bulbs, posterior spiracles with 3 bulbs (Skuhravá and Roques, 2000). The larva is illustrated in 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).

Reddish brown; posterior spiracles each with 3 bulbs (Spencer, 1976: 93).

Hosts in Great Britain and Ireland:

Betulaceae
Betula				Mines in BMNH
Betula				British leafminers
Betula				Spencer, 1972b: 39
Betula				Robbins, 1991: 73
Betula	pendula	Silver Birch		Mines in BMNH
Betula	pendula	Silver Birch		Robbins, 1989: 18
Betula	pubescens	Downy Birch		Robbins, 1989: 18.
Betula	pubescens	Downy Birch		Spencer, 1972b: 109
Carpinus				British leafminers

Hosts elsewhere:

Betulaceae
Betula				Spencer, 1976: 93
Betula				Spencer, 1990: 54
Betula	pendula	Silver Birch		Bladmineerders van Europa
Betula	pubescens	Downy Birch		Bladmineerders van Europa

Time of year - mines: June-November.

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Widespread in Britain including London (Hampstead), Kent (Darenth), Surrey (Oxshott), Yorkshire (Malham Tarn), Westmorland (Grasmere), Denbighshire (Cefn-y-bedd) (Spencer, 1972b: 39), Inner Hebrides (Isle of Coll, Arinagour) (Bland, 1992), Warwickshire (Coventry) (Robbins, 1991: 73) and Hampshire (Fleet) (British leafminers), Anglesey, Caernarvonshire, Cambridgeshire,East Gloucestershire, East Kent, East Ross, East Sussex, East Sutherland, Easterness, Elgin, Glamorgan, Hertfordshire, Leicesterahire, Merionethshire, Mid-west Yorkshire, Monmouthshire, Shropshire, South Lancashire, South Wiltshire, South-east Yorkshire, South-west Yorkshire, Stafford, Surrey, West Leicestershire, West Suffolk and Worcestershire (NBN Atlas).

Also recorded in the Republic of Ireland: Co. Clare. (Spencer, 1972b: 39).

Distribution elsewhere: Widespread in continental Europe including Denmark, Finland, Norway, Sweden (Spencer, 1976: 93), The Netherlands, Luxembourg (Bladmineerders van Europa), Belgium (de Bruyn and von Tschirnhaus, 1991) and Germany (Spencer, 1976: 546), Austria, Corsica, Czech Republic, Italian mainland, Lithuania, Romania, Slovakia and Switzerland (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: