Food Plant: A.cordata (Italian Alder), Alnus glutinosa (Alder) A. incana (Grey Alder)

Mine: Bivoltine:June-October

Pupa: Inside mine in a disc shaped cocoon (as shown).

Notes: A large blotch that normally starts at the margin, where some or much frass is ejected. Local and uncommon. Under-recorded due to being masked by the more common Fenusa dohrnii. H.vagans mines are generally single whereas F.dohrnii can be multiple.

Data: 20.x.2013, Stretham, Cambs, VC29

Image:© Ian Barton