This was a robust hidden-snout weevil about 5 mm long. In Camptorrhinites orarius, the stout, lightly ridged rostrum folded into a deep channel between the front coxae, but the channel closed immediately behind them rather than continuing onto the mesosternum. Rounded lobes partly covered the eyes, adding another layer of protection around the head, while the elytra remained smooth in outline rather than bearing raised tubercles.

The fossils do not preserve a host or feeding trace. Plant feeding is strongly inferred from its curculionid relationships, but the particular tissue used by the adult or larva is unknown. Two relatively complete pyritised adults give a good picture of the whole body plan despite compression, making this one of the better-known London Clay weevils anatomically even though its ecology remains largely inferential.