The first part of the book is the direct continuation of the volume 3, discussing the genus Shargacucullia. The authors had more than thirty years of expertise on this group but it was even so a great challenge to summarise the taxonomic knowledge on the entire genus, more than a century after the Catalogue of Hampson, the first and only monograph of this very fascinating, beautiful but often prettily difficult phylogenetic unit.
The second part of the volume is a monographic treatment of the Palaearctic and Oriental genera and species of the subfamily Psaphidinae (sensu Fibiger & Hacker 2005, Fibiger & Lafontaine 2005). In this part we propose solutions for certain evergreen taxonomic problems concerning with the genera Brachionycha, Xylocampa, Lamprosticta, Asteroscopus and Valeria.