Tapeigaster brunneifrons and T. argyrospila share a similar look that sets them apart from the other described species. They are darker overall, have eye orbits lined with whitish spots, and the tarsi are entirely pale. T. brunneifrons differs by having a much browner thorax and antennae, by the presence of whitish central stripes on the mesonotum (thorax dorsum), and by the deep-reddish colouring on the femora not contrasting against the black. In T. argyrospila the thorax and antennae are a brighter orange-red, the mesonotum is not marked with any central lighter stripes, and the femora are strikingly contrasted in parts with bright orange.