Koleopterologische Rundschau

The Austrian entomological journal Koleopterologische Rundschau is an excellent serial that is focussed on beetle taxonomy. It publishes a single issue a year, but this issue is filled to the brim with interesting and informative papers on beetles of all families from Europe and the world. Issues prior to 1990 (Volumes 1-59) are freely available online. PDF versions of papers published since then are also available, but at a cost. Unlike some other outfits though, this cost is actually reasonable; being around 1 Euro per paper.