Tropidia calcarata

{{Short description|Species of fly}}

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| genus = Tropidia (fly)

| species = calcarata

| display_parents = 3

| authority = Williston, 1887{{cite journal|last1=Williston|first1=S. W.|title=Synopsis of the North American Syrphidae.|journal=Bulletin of the United States National Museum|date=1887|volume=31|pages=xxx + 335|url=https://archive.org/details/cihm_28166|accessdate =1 July 2015}}

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Tropidia calcarata (Williston, 1887), the Lily-loving Thickleg Fly, is a rare species of syrphid fly observed from northeastern North America. Hoverflies can remain nearly motionless in flight. The adults are also known as flower flies for they are commonly found on flowers, from which they get both energy-giving nectar and protein-rich pollen. The larvae have been found on the rotting roots of an aquatic lily.{{cite book |last1=Skevington |first1=J.H. |last2=Locke |first2=M.M. |last3=Young |first3=A.D. |last4=Moran |first4=K. |last5=Crins |first5=W.J. |last6=Marshall |first6=S.A |title=Field Guide to the Flower Flies of Northeastern North America |date=2019 |publisher=Princeton University Press |location=Princeton, New Jersey |isbn=9780691189406 |pages=512 |edition=First| series= Princeton Field Guides}}