The Fire-eyed Diucon is a grey flycatcher with a red iris. In northwestern Patagonia, it uses humid forest edges, clearings and urban green spaces while catching insects.
Adults are described as lead-grey with a red iris, dark crown and dark primary feathers; the throat and outer tail feathers are pale. Juveniles have a brown iris.
It uses edges and clearings of humid forest as well as suburban and urban areas. It eats insects, catching them in flight and sometimes on the ground. In northwestern Patagonia it is described as resident and gathers in lower areas during winter.
An extinction-risk assessment has not been added yet.