Banded-Owl Butterfly

Uranus and Atreus looks almost the same. If you take a careful look at the dorsal pictures in the links you will see the differences immediately: The white-on-blue stripe in Uranus is more slim than in Atreus and is usually reaching the upper margin whereas the same stripe in Atreus is broader and will often not reach the upper margin in the same thickness. Most important feature however is the yellow part: In Uranus the whole lower margin of the hindwing is completely yellow, where in Atreus there is a little dark area at the outer side of the hindwing. http://butterfliesofamerica.com/caligo_uranus.htm http://butterfliesofamerica.com/caligo_atreus_dionysos_specimens.htm (these are all males, the link above in the ID section are the females)