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日本産トウヒ属6種の樹上には，9種のカサアブラムシにより，13種類の虫えいが形成される．トウヒ属の1樹種に対し，複数のカサアブラムシが虫えいを形成する場合でも，カサアブラムシの同一種が複数のトウヒ属樹種に虫えいを形成する場合でも，相互に虫えいに形態差が生じる．植物の種同定は従来から用いられてきた枝・葉・球果よりも，カサアブラムシ虫えい形態を用いたほうがより容易で，化石で産出した場合にトウヒ属の種同定が期待できる．第2世代成虫が羽化・脱出した後の乾燥した状態の虫えいについて，形態の記載を行い，分布地，宿主種，検索表を示した．, Thirteen sorts of galls are formed by 8 adelgid species on the 6 species of Picea which are native to Japan. Gall morphology is varied, and multiple species of adelgids can form galls on one Picea tree species.Conversely, one species of adelgid can form galls on multiple Picea tree species. The identification of Picea is simplified when using the morphology of adelgid galls rather than using traditional methods such as the analysis of twigs, leaves, and cones. This technique may also help the identification of Picea species in fossil studies. Morphology of the opened and dried galls for each adelgid species is described, and the distributions of host and adelgid species are presented. A key to the galls is also provided.