Walshomyia cupressi is a North American species of midge that induces galls on pygmy cypress and Sargent cypress trees in California and Oregon.

[1][2][3] The larval stage lasts for almost two years before adults emerge from exit holes from the side of the gall.

[2] The holotype species was collected in 1967 in Mendocino County, California and described by Raymond Gagné in 1969.

[4] This article related to members of the fly superfamily Sciaroidea is a stub.

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