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Genus Meromacrus

Meromacrus acutus - male fly - Meromacrus acutus - male Meromacrus acutus Acute Marks Flower Fly - Meromacrus acutus Fly - Meromacrus acutus - female Meromacrus acutus Meromacrus acutus? - Meromacrus acutus Meromacrus acutus? - Meromacrus acutus
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 Eristalina
Genus Meromacrus
Explanation of Names
Meromacrus Rondani 1848
meromacrus = 'big thighs'
5 spp. in our area(1), 43 total(2)
Mesonotum and abdomen mostly dark, with yellow markings of short, squamose pile; wings darkened anteriorly, distinctly so on apical half of anterior border; third vein deeply looped into apical cell.(3)
Martin Hauser: Meromacrus has a deep dip in the vein R4+5, in Milesia the dip is slight.
Meromacrus acutus vs Milesia virginiensis:

M. acutus (southeastern US(4) though BG records extend west to TX/OK/NE & north to IA): second abdominal segment black, facial stripe black, yellow tomentose patches very conspicuous(5)
M. draco (Texas to southwestern US(4)): second abdominal segment reddish brown, facial stripe reddish brown(5)
M. croceatus (California(4)): pale brownish orange, yellow tomentum, similar to M. gloriosus but pile on scutum is golden yellow vs. black in gloriosus(6)
M. gloriosus (Texas to southwestern US(4)): legs wholly light orange red (vs partly black in draco and acutus)(5)
M. panamensis (Panama(4)): similar to acutus but brown on wing in areas where acutus would be yellow(7), seems restricted to Panama(4)
New World, mostly neotropical(2)
Larvae are aquatic "rat-tailed maggots":
May-Sep (M. acutus in NC)(8)
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.Austalis, a new genus of flower flies (Diptera: Syrphidae) with revisionary notes on related genera
Thompson F.C. 2003. Zootaxa 246: 1-19.
4.Thompson F.C., Pape T., Evenhuis N.L. (2013) Systema Dipterorum, Version 1.5
5.The flies of the genus Meromacrus (Syrphidae).
F. M. Hull. 1942. American Museum Novitates, 1200: 1-10.
6.New species of Syrphidae and Asilidae (Diptera)
F. M. Hull. 1960. Pan-Pac. Ent. 36: 69-74.
7.New Syrphidae from Central America and the West Indies
C. H. Curran. 1930. Am. Mus. Novit. 416, 11 pp.
8.Insects of North Carolina
C.S. Brimley. 1938. North Carolina Department of Agriculture.