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Tatochila mercedis
Pieridae?
Garden; surrounding habitat was thorn scrub.
Certainly a Pieridae, Stephen, but a really tough one. I think it should be Tatochila mercedis, but I cannot get down to subspecies level. If you look at the several species and compare the markings, there is only Tatochila mercedis left.
Some others:
http://www.butterfliesofamerica.com/L/t/...
http://www.butterfliesofamerica.com/L/ih...
http://www.butterfliesofamerica.com/L/ih...
http://www.butterfliesofamerica.com/L/ih...
Maybe Tatochila mercedis sterodice:
http://www.butterfliesofamerica.com/L/ta...