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Family Cephidae - Stem Sawflies

Wasp? - Calameuta clavata sawfly - Cephus cinctus sawfly - Cephus cinctus Insct - Calameuta middlekauffi Cephid on buttercup - Calameuta clavata Blue Wasp with White Spot - Phylloecus trimaculatus Potential Stem Sawfly at Larson Trail - Cephus Cephus from montane Sierra Nevada - Cephus cinctus - male
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)(2)
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(3)

Overview of Species

      1. Calameuta clavata

      2. Calameuta middlekauffi

      3. Cephus cinctus

      —iNaturalist Specimen
      4. Cephus pygmaeus

      5. Trachelus tabidus


      —BOLD Specimens
      6. Caenocephus aldrichi

      —BOLD Specimens
      7. Phylloecus bicinctus

      8. Phylloecus cowichanus

      —Sawfly GenUS Specimens
      9. Phylloecus fasciatus

      10. Phylloecus riesi

      11. Phylloecus trimaculatus

      —BOLD Specimens
      12. Janus abbreviatus

      —BOLD Specimens
      13. Janus bimaculatus

      14. Janus integer

      —UGA Specimen
      15. Janus quercusae

      —BOLD Specimens
      16. Janus rufiventris
On grasses (incl. grain crops) and shrubs (incl. berries, roses, willows)(5)
Life Cycle
The larvae bore in the stems(5)
Some are serious pests, for instance the wheat stem sawfly
Internet References
[url]Spencer Entomological Museum - Cephidae Gallery[/url]
Works Cited
1.Nomina Insecta Nearctica
Poole, Robert W., Inc.
2.A New Western Nearctic species of Calameuta Konow (Hymenoptera : Cephidae)
David R. Smith and Nathan M. Schiff. 2005. Proceedings of the Entomological Society of Washington 107: 864-868.
3.The Cephid Stem Borers of California (Hymenoptera: Cephidae)
Woodrow W. Middlekauff. 1969. Bulletin of the California Insect Survey, Volume 11, University of California Press.
4.Catalog of Hymenoptera in America North of Mexico
Karl V. Krombein, Paul D. Hurd, Jr., David R. Smith, and B. D. Burks. 1979. Smithsonian Institution Press.
5.American Insects: A Handbook of the Insects of America North of Mexico
Ross H. Arnett. 2000. CRC Press.