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BugGuide Gathering
Smoky Mountains
University of Tennessee Biological Field Station
August 8-10, 2008
Details...
 
Photos from the last gathering (Minnesota 2007)

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Genus Meromacrus

Classification
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon (Aschiza)
Family Syrphidae (Syrphid Flies)
Subfamily Eristalinae
Tribe Eristalini
Genus Meromacrus
Explanation of Names
Author of genus is Rondani, 1848. From Latin (?) mero part, fragment, incomplete, plus macro/us, large (?). (Based on Internet searches.)
Numbers
Nearctica.com and Arnett (1) list 4 species.
Size
Circa 18 mm (M. acuta)
Identification
Syrphidae of Oklahoma (2), describes genus as follows in their key:
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.

Paraphrasing Martin Hauser:
If you check the wing venation you will see that Meromacrus has a deep dip in the vein R4+5, while Milesia has just a slight dip there. Compare Meromacrus acutas on the left, with Milesia virginiensis on the right:
Season
May-September (M. acuta, North Carolina).
Food
Found on flowers
Print References
Syrphidae of Oklahoma (direct link) (2)
Brimley, p. 352, lists M. acutus for North Carolina (3).
Castner, p. 147, fig. 545--has a photograph of what is likely M. acuta (4).
Internet References
Animal Diversity Web--shows classification
North Carolina State University Entomology Collection lists M. acuta/us for that state, with 25 pinned