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 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. The larva has short ringed feet and the characteristic ventral prothoracic plate (as shown). It has three further spots ventrally.

Data: 16.x.2005, Fleet, Hants, VC12

Image:© Rob Edmunds