Liorhyssus hyalinus is a species of scentless plant bugs belonging to the family Rhopalidae, subfamily Rhopalinae.

[12] Liorhyssus hyalinus can reach a length of 6.5–7.5 millimetres (0.26–0.30 in).

[13] The basic body color varies from yellow-brown to red, but the upperside of the abdomen is mainly dark.

This species can be distinguished by the length of the hyaline membrane of the hemelytra, which extends beyond the black upperside of the abdomen.

As the whole Rhopalidae family, this species a plant feeder.