This fly is approximately 1/2 inch (13 mm) in length. It is black on the thorax with 6 small yellow markings. The abdomen is black with 4 yellow crossbands. The 4th segment has a row of short, yellow hairs on the black portion, which distinguishes it from T. barberi which has black hairs on the 4th segment. The front legs are black with light-colored joints. The other legs are yellow. The wings are a clear tan color with darker brown on the leading edge. Like mason wasps, the wings are held out at an angle when the fly is perched and not folded over the abdomen. This fly was identified with the help of volunteer experts at the BugGuide Website.