Published in Entomologische Berichten Helder, in 1921, in volume 5, pages 298-300

Published in Entomologische Berichten Helder, in 1921, in volume 5, pages 300-301

Published in Entomologische Berichten Helder, in 1921, in volume 5, pages 330-338

Published in Entomologische Berichten Helder, in 1921, in volume 5, pages 345-348

Published in Entomologische Berichten Helder, in 1921, in volume 5, pages 348-351