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Species Polybiomyia macquarti

1/2 Inch Fly Nectaring - Polybiomyia macquarti - male Syrphid - Polybiomyia macquarti - female
Kingdom Animalia (Animals)
Phylum Arthropoda (Arthropods)
Subphylum Hexapoda (Hexapods)
Class Insecta (Insects)
Order Diptera (Flies)
No Taxon ("Aschiza")
Family Syrphidae (Hover Flies)
Subfamily Eristalinae
Tribe Cerioidini
Genus Polybiomyia
Species macquarti (Polybiomyia macquarti)
Synonyms and other taxonomic changes
Ceria scutellata Williston 1886
Polybiomyia macquarti Shannon 1925 [Note: Shannon observed that Williston's name Ceria scutellata was preoccupied by a 1842 species of Macquart.]
so. TX; Mexico
late Jun to late Aug
The trapezoidal shape of the yellow prescutellar markings are a significant diagnostic for this species. Shannon described them as "A large trapezoidal spot, or a pair of parallel spots", and he mentioned that in his two male specimens the "spots were divided" (i.e two parallel spots), whereas in the female type specimen they were united as a single spot. But images of females on BugGuide (e.g. here) and elsewhere (e.g. here) indicate they too can have the prescutellar spots divided.
Print References
Shannon, R.C. (1925) The syrphid–flies of the subfamily Ceriodinae in the U.S. National Museum Collection. Insecutor Inscitiae Menstruus, No. 13, 48–65. (Full Text)
Williston, S. W. (1886). Ceria on pp. 259-265 in: Synopsis of North American Syrphidae. Bull. U.S. Natl. Museum, 31:1-335 (Full Text)
Internet References
A BOLD specimen page with image showing a male exhibiting characteristic "side-by-side trapezoidal prescutellar spots".