49.086 Acleris logiana (White Birch Tortrix)
ws: 18-22mm; bivoltine in England Jun-Aug, Sep and overwintering, univoltine in Scotland Sep-Apr (overwintering as the adult); birch (Betula spp); NS-B patchily throughout GB
Synonym: Peronea niveana (Pierce & Metclafe)
Synonym: Peronea niveana (Pierce & Metclafe)
Acleris logiana §1 male form scotana
ID: Forewing ground colour whitish. Three named forms: logiana - indistinctly marked, proximal margin of median fascia demarcated by a line of dark raised scales; tripunctana - similar but with a costal blotch of 3 fuscous-black patches; scotana - with diffuse orange-brown streaks.
Form tripunctana is similar to the summer generation of A.kochiella which is generally more strongly marked and averages smaller (fw 7-9mm)
Male genitalia: Socii fairly long; 3 moderate cornuti. In A.kochiella the socii are very short and there are 5 or 6 slender cornuti.
Form tripunctana is similar to the summer generation of A.kochiella which is generally more strongly marked and averages smaller (fw 7-9mm)
Male genitalia: Socii fairly long; 3 moderate cornuti. In A.kochiella the socii are very short and there are 5 or 6 slender cornuti.
§1 Braemar, Aberdeenshire; 11/05/2016; male; fw 9.5mm; to light; form scotana
§2 Pound Wood, Essex; 11/07/2019; female; fw 7.6mm; to light; form tripunctana
§3 Orlestone Forest, Kent; 24/06/2020; form tripunctana
§4 Stour Wood, Essex; 14/07/2021; male; fw 8.1mm; to light; form tripunctana
§5 Black Wood of Rannoch, Perthshire; 04/04/2021; form tripunctana
All images © Chris Lewis
§2 Pound Wood, Essex; 11/07/2019; female; fw 7.6mm; to light; form tripunctana
§3 Orlestone Forest, Kent; 24/06/2020; form tripunctana
§4 Stour Wood, Essex; 14/07/2021; male; fw 8.1mm; to light; form tripunctana
§5 Black Wood of Rannoch, Perthshire; 04/04/2021; form tripunctana
All images © Chris Lewis
Page published 29/05/2016 (§1) | §2 added 24/02/2020 | §3 added 26/01/2021 | §4 added 10/08/2021 | §5 added 05/04/2022 |
text amended 03/08/2024
text amended 03/08/2024
