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Genus Helophilus

hover fly - Helophilus fasciatus - female Which Helophilus? - Helophilus fasciatus - male Unidentified Insect 145 - Helophilus fasciatus Syrphid Fly - Helophilus fasciatus - female unidentified Syrphidae - Helophilus fasciatus Drone Fly (Eristalis Tenax) ? - Helophilus fasciatus Helophilus fasciatus? - Helophilus fasciatus - male - female Fly - Helophilus fasciatus
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 Eristalini
Subtribe Helophilina
Genus Helophilus
Explanation of Names
Helophilus Meigen 1822
'marsh lover'
Numbers
9 spp. in our area(1)
Size
10-15 mm(2)
Identification
Lengthwise-striped thorax, transverse-striped abdomen, broad pterostigma.
Pterostigma of Helophilus and Parhelophilus (Lejops is similar):

Larva's ventral surface with 3 pairs of projections between the anal opening and the base of the long tail.
Range
Widespread, more speciose in n. Canada; ranges from(3):
H. fasciatus and latifrons widespread from so. Canada to Mexico
H. alaskensis, neoaffinis, stricklandi in far North
The other spp. boreal & western montane
Food
Larvae feed on submerged plant litter
Remarks
Unlike most species of Syrphidae, eyes of males not holoptic and not different from the eyes of females. Abdominal details are necessary to tell sex.
See Also
Parhelophilus (typically smaller, narrow pterostigma)
Lejops (also with narrow pterostigma)
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.Syrphidae of Oklahoma (Diptera)
Shorter D.A., Drew W.A. 1976. Proc. Okla. Acad. Sci. 56: 75-94.
3.A Catalog of the Diptera of America North of Mexico
Alan Stone, et al. 1965. United States Department of Agriculture.
4.Syrphidae of Ontario