"tenthredo amoena" can reach a length of about . these sawflies have a black body with yellowish markings and short antennae, that are about one and a half times the width of the head. the first antennal element is pure yellow. in the males the first, fifth and 7-8 tergites of the abdomen are yellow. the scutellum is often spotted with yellow. wings show a pale brown color with a long brown pterostigma. in the females the apex of tibiae and tarsi are yellow with black markings. the thighs are pure black.