Choerades marginata can reach a body length of about and a wings length of. In males the first antennal segment is about 1.8 - 2.1 times as long as the second one, while in female is 3 times longer. The sides of thorax and the humeral callus are distinctly tomentose and scutum has only few, normalhairs. The lateral sclerites have a greyish-brown tomentum, with sparse yellow and black hairs all over. Tergites and legs are entirely black. In males the face usually shows yellow hairs above the facialgibbosity, tergites have yellow hair at the sides and the last tergite has a straight, hindmargin.
Biology
Adults can be found from May to September. They prey on other flies.