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humeralis group

Which *sawfly* is this, please? - Arge humeralis Poison Ivy Sawfly - Arge humeralis argid sawfly - Arge Sumac Sawfly - Arge coccinea Sumac Sawfly - Arge coccinea Sawfly - Arge humeralis red and black fly - Arge Close to Arge illuminata but with coloration differences  - Arge spiculata - female
Classification
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 humeralis group
Numbers
6 spp. in our area; 14 spp. total(1)
1. A. arida: AZ
2. A. coccinea: eastern to TX (ON; CT, DC, GA, FL, IL, IN, KS, MA, MD, MI, MS, NC, NJ, NY, PA, RI, SC, TN, TX, VA, WV)
3. A. humeralis: eastern to NM (ON; AL, AR, CO, CT, DC, FL, GA, IA, IL, IN, KS, KY, LA, MA, MD, MI, MN, MO, MS, NC, ND, NE, NH, NJ, NM, NY, OH, PA, RI, SC, TN, TX, VA)
4. A. illuminata: southwestern (AZ, NM, TX)
5. A. spiculata: AZ
6. A. texana: TX
Identification
Keys to species after Smith (1989):(1)

Key to Adult Females
1a. Head entirely black; thorax primarily black ..................................................... 2
1b. Head with at least orange markings; thorax primarily orange ............................ 3

2a. Thorax with orange markings, abdomen orange, legs black, wings black ............. A. humeralis
2b. Thorax entirely black, abdomen black, legs with white markings, wings hyaline ... A. arida

3a. Legs beyond coxae black .............................................................................. 4
3b. Legs with tibiae and tarsi white ..................................................................... 5

4a. Thorax orange with black restricted to mesonotal lobes, wings black .................. A. coccinea
4b. Thorax orange with black restricted to mesosternum, wings posteriorly hyaline ... A. texana

5a. Antennae orange with black on flagellomeres 6-10 .......................................... H. spiculata
5b. Antennae entirely black ............................................................................... H. illuminata


A. coccinea A. humeralis A. illuminata A. spiculata

Key to Adult Males
Note: Males for A. illuminata (AZ-TX) and A. texana (TX) were unknown.

1a. Thorax usually orange-marked, eastern range ................................................. 2
1b. Thorax entirely black, southwestern range ...................................................... 3

2a. Eye small ................................................................................................... A. coccinea
2b. Eye large ................................................................................................... A. humeralis

3a. Tibiae white, wings hyaline ........................................................................... A. arida
3b. Tibiae black, wings black .............................................................................. A. spiculata


A. humeralis A. spiculata
Range
Western Hemisphere: ON to Colombia, most diverse in Mexico & sw. US; 2 spp. in e. NA(1)
Food
hosts: the eastern spp. on Rhus; hosts of other spp. unknown(1)
Works Cited
1.The sawfly genus Arge (Hymenoptera: Argidae) in the Western Hemisphere
Smith D.R. 1989. Trans. Am. Ent. Soc. 115: 83‒205.