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Leaf miner: The initial mine is usually in the form of a gallery, which expands to form a blotch. (British leafminers).

Large, almost full depth blotch with scattered frass. The mine is identical to that of M. pumilus, but the larva is different (Bladmineerders van Europa).

Larva: The larvae of sawflies have a head capsule, chewing mouthparts with opposable mandibles, six thoracic legs and abdominal legs (although they may be reduced) (see examples).

Larva with two ventral spots, whereas M. pumilis has two (British leafminers). The larva is also illustrated in Bladmineerders van Europa.

Pupa: The pupae of sawflies have visible head appendages, wings and legs which lie in sheaths.

Adult: Details unknown.

Hosts in Great Britain and Ireland:

Rosaceae
Rubus	fruticosus	Bramble / Blackberry		Pitkin & Plant
Rubus	idaeus	Raspberry		British leafminers
Rubus	idaeus	Raspberry		Pitkin & Plant

Hosts elsewhere:

Rosaceae
Rubus	idaeus	Raspberry		Bladmineerders van Europa

Time of year - larvae: Early autumn (British leafminers).

Time of year - adults: Currently unknown.

Comments: Full synonymy and references are listed in ECatSym - Electronic World Catalog of Symphyta.

See (British Leafminers Newsletter) for a A Guide to the British Metallus species.

Distribution in Great Britain and Ireland: Britain including Berkshire, East Suffolk and North Wiltshire (NBN Atlas).

Distribution elsewhere: Widespread in continental Europe including Austria, Czech Republic, Estonia, Finland, Germany, Hungary, Italian mainland, Poland, Russia Central, Sweden and The Netherlands (Fauna Europaea).

NBN Atlas links to known host species:

British and Irish Parasitoids in Britain and elsewhere: