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Family Cephidae - Stem Sawflies

Which wasp, fly, or sawfly is this, please? - Hartigia trimaculata Which wasp, fly, or sawfly is this, please? - Hartigia trimaculata Stem Sawfly, family Cephidae Stem Sawfly, family Cephidae Wasp - Hartigia trimaculata - female wasp? - Cephus wasp? - Hartigia trimaculata - female Sawfly? - Cephus cinctus
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon (Sawflies, Horntails, and Wood Wasps)
Family Cephidae (Stem Sawflies)
Numbers
Nearctica lists 14 species in 6 genera.
Identification
Slender, laterally compressed. Elongated pronotum. Mostly black, some with light colored markings. Clubbed antennae.
Remarks
The larvae bore in the stems of grasses and berries.
Some are serious pests, for instance the wheat stem sawfly. Some braconid wasps are used as biocontrols.