05 Jul 2016.
Peace Valley Park, Bucks Co, PA.
Found on Cephalanthus occidentalis.
ID courtesy of Bill Dean.
Identified as a female of the genus Syrphus on Bugguide. See: http://bugguide.net/node/view/1246283
Syrphus is a genus of hoverflies. It can be distinguished from other genera of the tribe Syrphini because it is the only genus that has long hairs on the upper surface of the lower lobe of the calypter. (as well as hairs on the rear margin of the calypter as in most Syrphini)