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Gall: An oval twig gall up to 10 mm long (Redfern et al, 2002: 387, fig 588), sometimes several arranged spirally around twig each containing one larva.

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.

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).

Yellowish grey to brown (Redfern et al, 2002: 387, fig 589); posterior spiracles on short stalks, each with three minute bulbs (Spencer, 1972b: 14 (fig. 13), 15).

Adults: The adults, including the halteres, are uniformly black, as in other British species of Hexomyza.

Hosts in Great Britain and Ireland:

Salicaceae
Populus	nigra	Black-poplar		Robbins, 1983: 24
Populus	nigra	Black-poplar		Spencer, 1972b: 119
Populus	tremula	Aspen		Spencer, 1972b: 120

Hosts elsewhere:

Time of year - galls: May-June.

Time of year - adults: Currently unknown.

Distribution in Great Britain and Ireland: Hertfordshire (Hoddesdon) (Spencer, 1972: 15), Warwickshire (Coventry) (Robbins, 1983: 23) and Surrey (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Austria, Germany, France, Spain (Spencer, 1976: 37), Belgium, Italian mainland and Poland (Fauna Europaea).

Also recorded in Canada from New Brunswick to British Columbia (Spencer, 1969a: 81) and in the U.S.A. from Washington State to New Mexico (Spencer, 1990: 81).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: