Temnostoma trifasciatum

{{Short description|Species of fly}}

{{Speciesbox

| image = Temnostoma trifasciatum 1.jpg

| image_caption = Temnostoma trifasciatum

| genus = Temnostoma

| species = trifasciatum

| authority = (Robertson, 1901){{cite journal|last1=Robertson|first1=Charles|title=Some New Diptera|journal=The Canadian Entomologist|date=1901|volume=33|issue=10|pages=285–286|doi=10.4039/Ent33284-10|url=https://www.biodiversitylibrary.org/page/3046945}}

| display_parents = 4

| synonyms = *Temnostoma trifasciata Robertson, 1901

}}

Temnostoma trifasciatum (Robertson, 1901), the Three-lined Falsehorn, is a rare species of syrphid fly observed in the eastern and central parts of the United States. 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. Temnostoma adults are strong wasp mimics. Larvae burrow in moist decayed wood.{{cite journal |last=Rotheray |first=G.E. |year=1993 |title= Colour Guide to Hoverfly Larvae (Diptera, Syrphidae) in Britain and Europe |journal=Diperists Digest |volume=9 |pages=155 |url= https://diptera.info/downloads/df_1_9_Colour_Guide_to%20Hoverfly_Larvae.pdf }}{{cite book |last=Skevington |first=Jeffrey H |author-link= |date=2019 |title= Field Guide to the Flower Flies of Northeastern North America. |url= |location= |publisher= |page= |isbn= 9780691189406 }}