It is native to the hottest parts of the southeastern United States and is considered beneficial because its diet includes many species of pest insects.

The appearance is somewhat variable, but the ground colour is usually bluish-black or purplish-brown, and there are characteristic red spots at the sides and rear of the scutellum.

Other recorded prey include beetles, planthoppers, weevils,[2] larvae of the long-tailed skipper (Urbanus proteus),[3] and the southern green stink bug (Nezara viridula).

[2] Euthyrhynchus floridanus has a longer period of development than any of its close relatives in the subfamily Asopinae.

As the adult female takes about a fortnight to mature, and lays a total of about 140 eggs, populations of this bug do not build up as quickly as some other species with shorter life cycles.