Volume 426 contains the following papers:
- A survey of East Palaearctic Gnaphosidae (Araneae). 2. Two new Gnaphosa Latreille, 1804 species from Western Mongolia (Yuri Marusik, Alexander A. Fomichev, Mikhail Omelko; 1-9)
- The myriapodological legacy of Victor Ivanovich Motschoulsky (1810–1871) (Sergei Golovatch; 11-16)
- Three new species from the subfamily Phyllocoptinae (Acari, Trombidiformes, Eriophyidae) in Iran (Parisa Lotfollahi, Enrico de Lillo, Karim Haddad Irani-Nejad; 17-27)
- The taxonomy and diversity of Platerodrilus (Coleoptera, Lycidae) inferred from molecular data and morphology of adults and larvae (Ladislav Bocak, Michal Masek; 29-63)
- Review of the genus Fontidessus Miller & Spangler, 2008 (Coleoptera, Dytiscidae, Hydroporinae, Bidessini) with description of four new species (Kelly Miller, Elizabeth T. Montano; 65-85)
- An update to the taxonomy of the genus Gastroserica Brenske (Coleoptera, Scarabaeidae, Sericini) (Wangang Liu, Ming Bai, Xing-Ke Yang, Dirk Ahrens; 87-110)
- Taxonomy of the Nacerdes (Xanthochroa) carniolica species-group from China (Coleoptera, Oedemeridae, Nacerdini) (Ying Tian, Ren Guo-Dong, Qiang Li; 111-118)
- The genus Macroteleia Westwood in Middle Miocene amber from Peru (Hymenoptera, Platygastridae s.l., Scelioninae) (Vincent Perrichot, Rodolfo Salas-Gismondi, John Flynn, Pierre-Olivier Antoine, Michael Engel; 119-127)