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Genus Helophilus

Syrphid fly from Iowa - question on genus - Helophilus fasciatus - male Helophilus sp. - Helophilus fasciatus Bee Mimic - Helophilus fasciatus WI100612 - 2b - Helophilus fasciatus - male - female Eristalinae? - Helophilus fasciatus - female ?Syrphid fly - Helophilus Parhelophilus ? - Helophilus fasciatus - male Helophilina - Helophilus fasciatus - male
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'
9 spp. in our area(1)
10-15 mm(2)
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.
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
Larvae feed on submerged plant litter
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