Note: Diptera larvae may live in a corridor mine, a corridor-blotch mine, or a blotch mine, but never in a case, a rolled or folded leaf, a tentiform mine or sandwiched between two more or less circular leaf sections in later instars. Pupation never in a cocoon. All mining Diptera larvae 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 larvae lie on their sides within the mine and use their pick-like mouthparts to feed on plant tissue. In some corridor miners frass may lie in two rows on alternate sides of the mine. In order to vacate the mine the fully grown larva cuts an exit slit, which is usually semi-circular (see Liriomyza huidobrensis video). The pupa is 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).

1a > Leaf mine. A narrow linear mine which may largely fill small leaves and produce a secondary blotch. Puparium orange

On Galium in Britain and additional genera of Lamiaceae elsewhere. Widespread in Britain and continental Europe.

Galiomyza morio (Brischke, 1880) [Diptera: Agromyzidae].

1b > Stem-mine.

2

2a > A narrow, whitish external stem mine. Pupation external

On Galium in Britain and Galium and Asperula elsewhere. Widespread in Britain and much of Europe.

Aulagromyza buhri (de Meijere, 1938) [Diptera: Agromyzidae].

2b > An external stem mine. Pupation external

On Galium in Britain and elsewhere. Widespread in Britain and western and central Europe.

Aulagromyza orphana (Hendel, 1920) [Diptera: Agromyzidae].

2c > An inconspicuous external stem mine, frass in widely-spaced grains. Pupation in the mine

On Galium in Britain and Galium and Asperula elsewhere. Uncommon in Britain - Suffolk and Surrey.

Ophiomyia galii Hering, 1937 [Diptera: Agromyzidae].