Hym:Tenthredinidae
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Heterarthrus vagans (Fallen, 1808)
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two larvae have mined the same leaf.

 

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

Mine: Univoltine: autumn.

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. Unusually two larvae have mined the same leaf and are making pupal discs (top middle)

Data: 11.xi.2012, Mol, (Antwerpen), Belgium.

Image:© Carina Van Steenwinkel

sponsored by Colin Plant Associates (UK) LLP/Consultant Entomologists

www.leafmines.co.uk