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Genus Sphaerophoria

Syrphid fly - Sphaerophoria sulphuripes - female Hoverflies - Sphaerophoria - male - female Syrphidae, spent puparium - Sphaerophoria contigua Syrphid Fly ? - Sphaerophoria - female Syrphinae - Sphaerophoria Syrphid fly - Sphaerophoria contigua - male Hoverfly, Sphaerophoria sp? - Sphaerophoria sulphuripes Syrphid Fly - Sphaerophoria sulphuripes - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Aschiza")
Family Syrphidae (Hover Flies)
Subfamily Syrphinae
Tribe Syrphini
Genus Sphaerophoria
Synonyms and other taxonomic changes
revised in(1)
Explanation of Names
Sphaerophoria Lepeletier & Serville 1828
14 spp. in our area(2)
5.9-10.8 mm(3)
usually associated with dry grassland, also around woodland paths or marshes(4)
Larvae feed on aphids. Adults take nectar and pollen and may be pollinators
Life Cycle
1. Puparium. 2. Mating pair
Two main groups in the key(5): species whose lateral scutum stripe ends at the transverse suture (novaeangliae, contigua, sulphuripes, pyrrhina) and those with a faint or strong stripe extending past the suture (scripta, philanthus, brevipilosa, longipilosa, cranbrookensis, asymmetrica, weemsi, bifurcata, abbreviata). The former are usually keyable to species in both sexes (though male sulphuriphes and pyrrhina cannot be told apart); the latter are generally impossible to key from photographs with the exception of male scripta (found only in Greenland) and philanthus and female scripta, cranbrookensis, and bifurcata. In Vockeroth's key, multiple species of females in the latter group fall out together, and can only be told apart when attached in copula to a male that is then keyed from the genitalia.
Stripe ends at the transverse suture (click for an explanation on the first image):

Stripe continues past the transverse suture, either strongly (as in the first image) or more weakly (as in the second image):
Works Cited
1.Taxonomic revision of aphid-killing flies of the genus Sphaerophoria in the Western Hemisphere (Syrphidae)
Knutson L.V. 1973. Misc. publications of the Entomological Society of America 9, 1-50.
2.Key to the genera of nearctic Syrphidae
Miranda G.F.G, Young A.D., Locke M.M., Marshall S.A., Skevington J.H., Thompson F.C. 2013. Can. J. Arthropod Identification 23: 1‒351.
3.Flower Flies (Syrphidae) -
4.Hover Fly Survey of LA County
5.The flower flies of the subfamily Syrphinae of Canada, Alaska, and Greenland, Diptera: Syrphidae
Vockeroth J.R. 1992. The insects and arachnids of Canada, Pt. 18. Ottawa: Agriculture Canada. 456 pp.