Switzerland, June 2018
Male, Switzerland, June 2016
Male, Switzerland, July 2019
Female, Switzerland, June 2016
Male on left, female on right, Switzerland, July 2013
Female, Switzerland, June 2011
Male, Switzerland, June 2011
Male, Switzerland, June 2011
Switzerland, June 2012
Switzerland, June 2011
Distribution
The northern wall is the upland specialist in the wall group, Lasiommata.
It is more local than its cogeners but may be very common where found -
typically in open, sunny places with rocks and low vegetation. It is
particularly fond of basking on rocks, often in exposed places on
tracks or scree and is less commonly seen taking nectar. Although it
flies up to alpine levels - well over 2000m - it may also be seen in
hot valleys in mountainous regions. I have found it near Martigny in
the Rhône Valley of Switzerland.
In appearance, this is a smallish, dark wall. From a distance, a male
may even resemble an Erebia
species, with the orange postiscal band set against the deep brown
ground colour, but in behaviour and jizz it is very different. Some
large walls are similar in overall pattern - especially males, which
are typically darker than females - but may always be separated by the
upperside of the hindwing. The northern wall has a dark, wavy,
transverse line across the middle, usually with a slightly paler area
outside this. There may be a hint of this line in the large wall but it
is never so complete or obvious. Like the large wall but unlike the
wall, the northern wall usually has double-ringed ocelli on the
underside hindwing. The underside of the forewing has a broad, grey
costal area, further aiding identification when this is visible - the
area is generally brighter in large wall and always brighter in wall.
The northern wall is single-brooded, flying from April in the south and
at low altitudes through until the end of July or early August. It may
hibernate as a larva or a pupa. The foodplants are various grasses.