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Gall: An oval gall in the cortex of a twig (see Redfern et al, 2002: 433, fig. 816); several galls may coalesce round stem. Pupation internal.

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, but the front segments are bright reddish brown (see also Redfern et al, 2002: 433, fig. 817); posterior spiracles each with three minute bulbs on short stalk (Spencer, 1972b: 15).

Adults: The adults, including the halteres, are uniformly black. Hexomyza simplicoides may be distinguished from the two other species of the genus recorded in Britain, sarothamni and simplicicoides, by the costa ending at or shortly beyond vein R4+5.

Hosts in Great Britain and Ireland:

Salicaceae
Salix				Spencer, 1972b: 15
Salix	caprea	Goat Willow		Spencer, 1972b: 120

Hosts elsewhere:

Salicaceae
Salix				Spencer, 1990: 93
Salix	caprea	Goat Willow		Spencer, 1976: 39

Time of year - galls: April-May.

Time of year - adults: end of May or early June.

Distribution in Great Britain and Ireland: Widespread in Britain including Surrey (Box Hill, Effingham and Oxshott) and Cambridgeshire (Kirtling) (Spencer, 1972b: 15), North Ebudes, South Somerset and Surrey (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe and temperate Asia, with confirmed records from Spain, Finland, Germany, Austria, Hungary, the Kirghiz Republic of the [former] U.S.S.R. (Spencer, 1976: 39), French mainland, Italian mainland, Lithuania, Poland, Switzerland and The Netherlands (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: