388 Prochoreutis myllerana
(Fabricius, 1794)Wingspan 10-14 mm.
P. myllerana is widespread in Britain and is sometimes locally common, resting on or flying over its foodplants (Scutellaria spp.), from May to early September. The life cycle is probably in three overlapping generations, with ova, larvae, pupae and adults often all occurring at the same time. Many old records are uncertain because it closely resembles Prochoreutis sehestediana, although there are subtle differences, mentioned under that species.
The larva lives at first under a web on a leaf and later in a rolled leaf. Larvae of the various generations probably feed in all months from April to early October. Those from late August ova grow to about 5 mm in the fourth instar in October and then cease feeding and growth, even if kept indoors in warmth. It is assumed winter diapause is passed at this stage, and that feeding is completed on new growth of the foodplants in the following April.