Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. The Purple Treble-bar (Aplocera praeformata) is a moth of the Geometridae family. It is found from the Iberian Peninsula and France, through Western Europa, over Central Europa up to Russia. Its northernmost range is Southern Finland and the Baltic States. The subspecies Aplocera praeformata urbahni is found in Greece. In the Alps it is found to heights of up to 2,000 meters. It has a wingspan of 34 44 mm. Adults are on the wing from June to August. It has one generation a year.