Nationally scarce (Nb) in damp grassland and moorland in parts of Britain, also occurring in Ireland. In Hampshire, has a similar distribution to
P. sehestediana, being known from scattered locations, historically the New Forest and Botley Wood; 2023 saw two new localities for the species in the north-east. Not recorded from the Isle of Wight since 1931. Wingspan 10-14 mm. Day-flying. Similar to
P. sehestediana, but in
P. myllerana white spots on forewing on average larger and more rounded; patch of white irroration extends from dorsum at most halfway across wing; no pale fascia beyond postmedian line of silvery spots; termen slightly more curved and apex less acute (MBGBI Vol 2). Larva feeds on Skullcap and Lesser Skullcap.