Lefnadsförhållanden och instinkter inom familjerna Pompilidae och Sphegidae. I-IV.

1903-1912 181, 48, 75, 61 p., roy. 4to (22.5 x 27 cm), cloth with paper label on spine. Original printed front covers of all four parts inserted at rear. One front cover with author’s dedication to Wahlgren. Published in: Kungl. Svenska Vetenskapsakademiens Handlingar. Library stamps, else very good and well bound copy.