Battus crassus

Battus crassus, the Crassus swallowtail, is a species of butterfly from the family Papilionidae.

Description
A very long-winged species. Forewing with white patches in and below the cell; hindwing with large white costal area, which in the male reaches to the base. In the subspecies lepidus Fldr. the white patches on the upper surface of the forewing are absent.

The black-brown larva (probably variable in its ground colour) has no spots. The thoracic hump of the pupa is very long and divided at the tip.

Food plants
The larvae feed on:
 * Aristolochia cymbifera
 * Aristolochia esperanzae
 * Aristolochia gigantea
 * Aristolochia macroura
 * Aristolochia veraguensis
 * Aristolochia odora
 * Aristolochia didyma
 * Aristolochia brasiliensis

Subspecies

 * Battus crassus crassus (Peru, Surinam, Brazil: Amazonas, Rio de Janeiro, northern Argentina: Misiones)
 * Battus crassus hirundo (Röber, 1925) (northern Bolivia)
 * Battus crassus paraensis (Brown, 1994) (Brazil: Pará)
 * Battus crassus lepidus (C. & R. Felder, 1861) (Costa Rica, Venezuela, western Colombia, western Ecuador)

Status
Widespread but solitary and rarely collected. HERE