Crasilogia is a genus of moths in the family Geometridae described by Warren in 1903. It is sometimes considered a synonym of Costaconvexa.

Species Crasilogia dispar Warren, 1903 Crasilogia flavipennis Warren, 1907 Crasilogia fulvitincta Joicey & Talbot, 1917 Crasilogia fumipennis Warren, 1906 Crasilogia gressitti Holloway, 1984 Crasilogia simplex (Prout, 1940)

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