Knobbled Weevil

The adults of Hadramphus stilbocarpaeare 15.5-21.7mm in length. The body is dark brown and covered in dark brown to greyish brown scales. The upper surface of the pronotum has pale lines running down the middle and along the margins. The elytra has an oval shape with tubercules on the third, fourth, fifth and seventh intervals. As larvae, H. stilbocarpae reach a maximum size of 17.5mm in length. The head is coloured blackish brown and has easily visible anterior ocelli (but the posterior ocelli are indistinct). When they pupate, H. stilbocarpae can reach up to 17mm in length. They are quite similar to Lyperobius.

This species is endemic to New Zealand. They are only known from the subantarctic Snares Island, Stewart Island and Resolution island in the Fiordland region. In 1991, a population was translocated to Breaksea Island, also in Fiordland. They are known to occur in vegetation along the coast.

The larvae of Hadramphus stilbocarpae feed on the rhizomes of plants. They have been recorded feeding on Anisotome lyallii, Azorella lyallii, and Azorella robusta. As adults, they are often observed feeding on leaves of plants.