Colotrechnus is a genus of wasps belonging to the family Pteromalidae.

The species of this genus are found in Europe and North America.

Species: Colotrechnus agromyzae Subba Rao, 1981 Colotrechnus ignotus Burks, 1958 Colotrechnus subcoeruleus Thomson, 1878 Colotrechnus viridis (Masi, 1921)

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