Published in Annales de la Société Entomologique de Belgique, in 1921, in volume 61, pages 21-29

Published in Annales de la Société entomologique de Belgique, in 1921, in volume 61, pages 57-67

Published in Annales de la Société entomologique de Belgique, in 1921, in volume 61, pages 68-87

Published in Annales de la Societe Entomologique de Belgique Bruxelles, in 1921, in volume 61, pages 109-112

Published in Annales de la Société Entomologique de Belgique (Ann. Soc. ent. Belg.), in 1921, in volume 61, pages 151-153

Published in Ann. Soc. Ent. Belg, in 1921, in volume 61, pages 157-161

Published in Annales de la Société Entomologique de Belgique, in 1921, in volume 61, pages 165-168

Published in Annales de la Société Entomologique de Belgique, in 1921, in volume 61, pages 310-312

Published in Ann. Soc. ent. Belg, in 1921, in volume 61, pages 333-335