Battus eracon

Battus eracon, the west-Mexican swallowtail or Colima swallowtail, is a species of butterfly in the family Papilionidae. It is found in western Mexico where it is local and uncommon. The larvae feed on Aristolochia tentaculata.

Description
The forewing has a row of submarginal spots. The hindwing has a uniformly curved band of spots, placed about midway between the cell and the outer margin. Under surface of the hindwing has red submarginal spots, each with a yellowish white dot at the outer side.