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Genus Syritta

Syritta pipiens - male Syritta pipiens ? - Syritta pipiens Syrphidae ? - Syritta pipiens - male  Syphidae family, Syritta pipiens ? - Syritta flaviventris small Syrphid Fly with striped abdomen - Syritta pipiens Syritta pipiens? - Syritta pipiens Syritta flaviventris? - Syritta flaviventris syrphid 1 - Syritta pipiens - female
Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Aschiza")
Family Syrphidae (Syrphid Flies)
Subfamily Eristalinae
Tribe Milesiini
Subtribe Tropidiina
Genus Syritta
Explanation of Names
Syritta Lepeletier & Serville 1828
Numbers
2 spp. in our area(1), ~70 spp. worldwide(2)
Size
6.5-9.5 mm(3)
Identification
S. pipiens:
apical third of hind femur with row of spines along ventral edge (photo)
wing with spurious vein present

S. flaviventris:
base of hind femur with prominent projection in males - lacking in S. pipiens (photos)
wing with spurious vein absent
Range
worldwide; in our area:(2)
S. pipiens: across the US & so. Canada (except the arctic)
S. flaviventris: TX & Mexico; widespread in East as well (likely of African origin)
Habitat
larvae in wet decaying organic matter (manure, compost, silage)(3)
Season
S. pipiens: mid-Apr to mid-Oct in ON(3)
Print References
Pérez-Bañón C., Marcos-García A. M. (2000) Description of the immature stages of Syritta flaviventris (Diptera: Syrphidae) and new data about the life history of European species of Syritta on Opuntia maxima. Eur. J. Entomol. 97: 131-136 (Full text)

Thompson, F.C., Fee, F.D. and Berzark, L.G. 1990. Two immigrant synanthropic flower flies (Diptera: Syrphidae) new to North America. Entomological News, 101: 69-74. (Full text)
Internet References
Works Cited
1.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.
2.Thompson F.C., Pape T., Evenhuis N.L. (2013) Systema Dipterorum, Version 1.5
3.Syrphidae of Ontario