Food Plant: Alnus glutinosa (Alder) and Alnus cordata (Italian Alder)

Mine: Univoltine: autumn.

Pupa: Inside mine in a disc shaped cocoon.

Notes: A large blotch (as shown) 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: 12.x.2004, Fleet, Hants, VC12

Image:© Rob Edmunds