A generic revision of the Pieridae (Lepidoptera) together with a study of the male genitaliaPublished in Entomologica Americana, in 1933, in volume 12, pages 139-242The Nearctic social wasps of the subfamily Poly biinae (Hymenoptera; Vespidae)Published in Entomologica Americana, in 1933, in volume 13, issue 1932, pages 87-148
The Nearctic social wasps of the subfamily Poly biinae (Hymenoptera; Vespidae)Published in Entomologica Americana, in 1933, in volume 13, issue 1932, pages 87-148