The wingspan is 70–80 mm. It is immediately distinguishable from all other
Callionima species by the forewing upperside pattern and hindwing upperside colour. The forewing upperside is deep brown with a pale brown triangular patch on the costa and a silver discal spot represented only by a minute dot. The hindwing upperside is dark brown with a buff base. Callionima nomius MHNT CUT 2010 0 348, Pk2 Guyane male dorsal.jpg|Male dorsal Callionima nomius MHNT CUT 2010 0 348, Pk2 Guyane male ventral.jpg|Male ventral Callionima nomius MHNT CUT 2010 0 337 Napo Ecuador female dorsal.jpg|Female dorsal Callionima nomius MHNT CUT 2010 0 337 Napo Ecuador female ventral.jpg|Female ventral == Biology ==