Differing from N. cuprilatera in frons not widely depressed, body shape narrower and less flattened, pronotum with wider and less sharply defined metallic-coloured sides which are mostly reddish or coppery (in b oth males and females), underside with posterior part grey to bronze rather than green or blue, and elytra with some gold reflections especially about the scutellum and humeral margin.

In SA, N. dichroa has been found on a wide range of hosts, including at least nine Eucalypt species. A series of nine specimens collected as part of a pollination study in Flinders Chase National Park are labelled as being from Eucalyptus porosa, a species not native to the area and unlikely to have been planted there. This is presumed to refer to E. albopurpurea, a related Eucalypt which is from the same section of the genus and of similar appearance.