Hym:Tenthredinidae
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Heterarthrus vagans (Fallen, 1808)
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larva about to pupate

 

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.

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

Image:© Ian Barton

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