title: "Sex-ratio" condition: unusual mechanisms in bark beetles.
abstract: Although males and females occur in similar frequency in the broods of most scolytid beetles, certain individuals of several species produce offspring highly aberrant in the ratio of sexes-all or mostly female. In some instances this condition reflects gynogenesis (parthenogenesis stimulated by mating); in others, a maternally transmitted factor.
authors.forename: G N
authors.initials: GN
authors.lastname: Lanier
authors.forename: J H
authors.initials: JH
authors.lastname: Oliver