Phoebis sennae marcellina (Cramer, 1777);  Comments: SW USA (strays far N), S TX through Panama, most S. America TL: Surinam.

Phoebis sennae marcellina ♀ last instar, length 23 mm
COSTA RICA: Guanacaste Prov.: Area de Conservacion Guanacaste, Sector Santa Rosa,
Area Administrativa, 295m, collected on 23-V-1986 as penultimate instar, photographed on 23-V-1986
foodplant Senna pallida
voucher code 86-SRNP-17, image code 86-SRNP-17-DHJ9314.jpg
image from http://janzen.sas.upenn.edu/