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yellow-green butterfly, looks a lot like a senescent leaf of Passiflora subpeltata
on Passiflora subpeltata leaf, xerophytic shrubland in Mexico City, University campus El Pedregal de San Ángel, on a lava field 2500 years old
Similar but another genus. Clouded Sulphur is a Colidae and would look like this:
http://www.butterfliesandmoths.org/speci...
Those two brown ringed spot identifies it as a clouded sulphur. We have this butterfly in our region.
Folks, you are on the wrong side of the globe ;-)...
This is a neotropical Pieridae, Phoebis sennae marcellina. Grass Yellow and Emigrant are Asian/Australian species.