Chalcosyrphus curvaria

Chalcosyrphus (Xylotomima) curvaria (Curran, 1941) the Yellow-haltered Leafwalker, is a common species of syrphid fly found throughout Northern 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.

Distribution
Canada, United States.