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n.1.(Zool.) A genus of large hymenopterous insects allied to the sawflies. The female lays her eggs in holes which she bores in the trunks of trees with her large and long ovipositor, and the larva bores in the wood. See Illust. of Horntail.
References in periodicals archive ?
The horntail wasp (Tremex columba (L.), Siricidae) has larvae that bore into the trunks of many deciduous trees, and they are eaten in turn by the parasitoid ichneumon wasp (Megarhyssa lunator (Fabr.), Ichneumonidae).