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Leaf-miner: Mine linear, whitish, both upper and lower surface. Pupation internal, at the end of the mine with the anterior spiracles projecting through the epidermis (Spencer, 1976: 433).

Upper-surface, less often lower-surface corridor. Frass in isolated grains. Pupation within the mine, in a, usually lower-surface, puparial chamber (Bladmineerders van Europa).

A long whitish upper surface corridor, which eventually goes lower surface (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.

The larvae is described by Dempewolf (2001: 202).

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).

Whitish (Spencer, 1976: 433). The anterior spiracles penetrate the plant epidermis as a pair of tiny hooks (Bladmineerders van Europa).

Adult: The adult is illustrated in the Encyclopedia of Life.

Comments: Two highly polyphagous species of Chromatomyia, with indistinguishable mines, have been recorded on Asteraceae in Britain. These are syngenesiae (Hardy), which is almost entirely restricted to Asteraceae and horticola (Goureau), which mines numerous plant families including Asteraceae. The two species can only be distinguished by the structure of the male genitalia.

British records of syngenesiae, horticola or 'atricornis' on hosts other than Asteraceae in Britain, except when the male genitalia have been examined (i.e. Dahlia), are assumed here to represent horticola.

British records of horticola and syngenesiae on Asteraceae hosts not based on examination of the genitalia of reared males are treated here as Chromatomyia 'atricornis'.

Gentiana asclepiadea, Gentiana pneumonanthe