albitarsis Zetterstedt, 1848. Diptera Scandinaviae. 7:
2735. [Preoccupied by Agromyza albitarsis Meigen, 1830]
Agromyza alnivora Spencer, 1969c. Beitr. Ent. 19:
Agromyza alnivora Spencer, 1969c; Spencer, 1972b. Handbk
ident. Br. Ins. 10(5g): 37 (figs 116-8), 39, 42, 109
Agromyza alnivora Spencer, 1969c; Spencer, 1976. Fauna
ent. Scand. 5(1): 93-5, figs 131-133
Agromyza alnivora Spencer, 1969c; Spencer, 1990. Host
specialization in the world Agromyzidae (Diptera) : 54, 60 (fig.
226), 61, 100, 178.
forming a linear leaf-mine, considerably widening at end (Spencer,
1976: 94-95, fig. 133).
upper-surface corridor, initially very shallow, gradually widening
(often quite broad in the end), not associated with leaf margin
or veins; mature mine often with a characteristic brown colouration.
Frass in two rows. The gold-coloured larva leaves the mine before
pupation, through a semicircular exit slit in the upper epidermis
(Bladmineerders van Europa).
An upper surface gallery, narrow at first but, widening considerably towards the end (British
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 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).
Hosts in Great Britain & Ireland:
of year - mines: July, August-September.
of year - adults: September and June-July the following year.
in Great Britain & Ireland: Widespread in Britain including
Kent (St Mary's Cray), Oxford (Hogley), Cambridge (Chippenham Fen)
(Spencer, 1972b: 39), Warwickshire
(Coventry) (Robbins, 1991:
78), Inverness (Nethy Bridge) (Spencer, 1972b: 39), the Inner Hebrides (Isle of Coll, Arinagour) (Bland,
1992), Hampshire (Fleet) (British
leafminers) and Shropshire (VC40), South Wiltshire (VC8), Staffordshire (VC39), Surrey (VC17), West Gloucestershire (VC34) and Worcestershire (VC37) (NBN
elsewhere: Widespread in continental Europe including Austria,
Denmark, Finland, Germany, Holland, Norway, Romania, Sweden (Spencer,
1976: 95), Czech Republic, French mainland, Lithuania, Poland
and Slovakia (Martinez in Fauna Europaea).
NBN Atlas links to known host species:
British and Irish Parasitoids in Britain and elsewhere: