By THÉRÈSE MARGOLIS     Back in 1910, Mexican printmaker, engraver and newspaper cartoonist José Guadalupe Posada frequently used images of human skulls and bareboned skeletons to make political and cultural critiques of what he perceived of as the absurdities of Mexican society. One of his most famous skeletal images was that of Catrina, an elegant skull dressed only in an oversized

By THÉRÈSE MARGOLIS     Back in the 1910, Mexican printmaker, engraver and newspaper cartoonist José Guadalupe Posada frequently used images of human skulls and bareboned skeletons to make political and cultural critiques of what he perceived of as the absurdities of Mexican society. One of his most famous skeletal images was that of Catrina, an elegant skull dressed only in an