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Family Cephidae - Stem Sawflies

Sawfly? - Cephus cinctus wasp - Calameuta clavata - female sawfly - Calameuta clavata Insct stem sawflies - male - female Calameuta clavata ♀? - female Cephus from montane Sierra Nevada - Cephus cinctus - male Stem Sawfly
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Hymenoptera (Ants, Bees, Wasps and Sawflies)
No Taxon ("Symphyta" - Sawflies, Horntails, and Wood Wasps)
Family Cephidae (Stem Sawflies)
16 spp. in 6 genera north of Mexico(1)
Mesonotum not divided by a transverse groove between bases of fore wings. Protibia with 1 apical spur. Last tergum and last sternum of both sexes apically thin and without cylindrical projection. Pronotum in lateral view sloping forward at about 45°; pronotum in dorsal view with posterior margin weakly concave, with medial length over one-half lateral length. Fore wing with posterior-most vein (2A) straight, parallel to, and mostly close to posterior margin of wing. Pedicel much shorter than flagellomere 1. Metanotum without cenchrus.
Slender, laterally compressed. Elongated pronotum. Mostly black, some with light colored markings. Clubbed antennae.
keys to NA genera and CA spp. in(2)
Across the continent(1)
On grasses (incl. grain crops) and shrubs (incl. berries, roses, willows)(1)
Life Cycle
The larvae bore in the stems(1)
Some are serious pests, for instance the wheat stem sawfly
Internet References
Works Cited
1.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.
2.The Cephid Stem Borers of California (Hymenoptera: Cephidae)
Woodrow W. Middlekauff. 1969. Bulletin of the California Insect Survey, Volume 11, University of California Press.