70.236 Ennomos erosaria (September Thorn)
fw: 17-21mm; Jul-Oct; oaks (Quercus spp), birches (Betula spp), limes (Tilia spp), beech (Fagus sylvatica); common in woodland in England
and Wales, less common in Scotland.
Ennomos erosaria (September Thorn) §1 male
ID: distinguished from other Ennomos
species by the nearly complete absence of speckling of the forewing and the
absence of a central crescent between the two cross-lines. Male E.quercinaria
(August Thorn) is more orange particularly along the termen near the wing apex;
female E.quercinaria can be quite plain and with only a trace of the central
crescent. At rest E.erosaria holds its wings half raised while E.quercinariae
holds its wings at a more shallow angle. In E.erosaria the distal cross-line
approaches the costa smoothly (without kinking) with its distal edge slightly
curved towards the apex; in E.quercinaria there is usually a kink in this
cross-line as it approaches the costa.
§1 Bookham Common, Surrey; 23/07/2013; male; fw 17.2mm
§2 New Forest, Hampshire; 30/08/2013; male
§3 New Forest, Hampshire; 30/08/2013; male; fw 18.2mm
§4 Bernwood Forest, Oxfordshire; 17/08/2017; male; fw 17.4mm
§5 Middlewick Ranges, Essex; 23/08/2023; female; fw 19.5mm
All images © Chris Lewis
§2 New Forest, Hampshire; 30/08/2013; male
§3 New Forest, Hampshire; 30/08/2013; male; fw 18.2mm
§4 Bernwood Forest, Oxfordshire; 17/08/2017; male; fw 17.4mm
§5 Middlewick Ranges, Essex; 23/08/2023; female; fw 19.5mm
All images © Chris Lewis
Page published 01/01/2014 (§1-3) | §4 added 18/04/2018 | §5 added 26/12/2023
