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Correction
Published in Psyche: A Journal of Entomology, in 1901, in volume 9, issue 300, pages 191
Willem on Apterygota
Published in Psyche: A Journal of Entomology, in 1901, in volume 9, issue 305, pages 252
Kermes quercus Linn
Published in Psyche: A Journal of Entomology, in 1901, in volume 9, issue 306, pages 258-259