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pectoralis group

Yellow Caterpillar - Arge pectoralis another oak sawfly - Arge quidia Elm Argid Sawfly - Arge scapularis sawfly with orange butt - Arge quidia Oak sawfly larva - Arge quidia Unknown Bug - Arge Elm Sawfly - Arge scapularis Arge tumsua - female
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 Argidae (Argid Sawflies)
Genus Arge
No Taxon pectoralis group
6 spp. in our area, a dozen total(1); not yet in the guide: A. rumica (w. NV & so. CA), A. salicis (e. US: NJ-SC to IL-KY), A. tumsua (e. NA: QC-RI to ON-MI-OH)
holarctic; in our area, mostly eastern; A. pectoralis is transcontinental in the north, A. rumica is our only western sp. (w. NV & so. CA)(1)
Works Cited
1.The sawfly genus Arge (Hymenoptera: Argidae) in the Western Hemisphere
Smith D.R. 1989. Transactions of the American Entomological Society 115: 83-205.