Takahashi, R. 1956 Dimorphism in some species of Chionaspis or Phenacaspis. (Diaspididae, Coccoidea, Homoptera).. Bollettino del Laboratorio di Zoologia Generale e Agraria "Filippo Silvestri" 33: 48-56.
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Notes: Discussion of 8 Japanese Chionaspis, including enkianthi n. sp. Key to 14 Japanese Chionaspis.