Rhogogaster punctulata can reach a length of. Body and head are bright green. This sawfly bears on the head a black drawing in the form of the Greek letteromega and very small black dots along the sides of the abdominal segments. The blackmarkings on the top of the abdomen are absent or quite reduced. Like other sawflies, this species lack the slender "wasp-waist" between the thorax and abdomen. Similar species are Rhogogaster viridis, that showsevident black marks on the upper surface of the abdomen. Adults can mostly be encountered from May through July.