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Species Tethida barda - Black-headed Ash Sawfly

Fly/Wasp - Tethida barda Tenthredinidae? - Tethida barda Sawfly larvae on ash tree - Tethida barda Sawfly larvae on ash tree - Tethida barda Sawfly - Tethida barda sawfly larva? - Tethida barda Sawfly larva - Tethida barda Tenthredinidae, Black-headed Ash Sawfly, dorsal - Tethida barda
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 Tenthredinidae (Common Sawflies)
Subfamily Blennocampinae
Tribe Tomostethini
Genus Tethida
Species barda (Black-headed Ash Sawfly)
Synonyms and other taxonomic changes
Tethida cordigera: Tenthredo cordigera Beauvois 1809 nec Geoffroy 1785
Explanation of Names
Tethida barda (Say 1836)
average: ♂ 6.8 mm, ♀ 7.2 mm(1), larva to 18 mm
e. NA (NS-FL to SK-TX)(1) + CA(2)
Deciduous forests or areas with Ash (Fraxinus) trees.
Mid-April to end of June in the north
Larvae feed on Ash Fraxinus(1)
Life Cycle
larvae | later instar larva | adult

Females make slits in Ash leaf stems and lay 6 to 10 eggs per leaf. Hatching occurs within 2 to 3 days. 1st instar lasts 3 to 4 days. Larvae feed on the underside of the leaves. Overwinter as mature larvae in a cocoon on the ground. Pupate in spring. One generation per year in the north.
Works Cited
1.Nearctic sawflies. I. Blennocampinae: Adults and larvae (Hymenoptera: Tenthredinidae)
D.R. Smith. 1969. Agricultural Research Service, USDA Technical Bulletin No. 1397. 179 pp.
2.Garden Insects of North America : The Ultimate Guide to Backyard Bugs (Princeton Field Guides)
Whitney Cranshaw. 2004. Princeton University Press.