Description: English: Syrphid - Tropidia quadrata, Dans Mountain State Park, Lonaconing, Maryland. 8/29/2013 Allegany County - identified by Dr. Hauser, bugguide. Date: 29 August 2013, 13:19:11. Source: https://www.flickr.com/photos/52450054@N04/9732977897/. Author: Judy Gallagher.