This proposition try to bring lights about Seth (1891- 1949) - one of the most importants brazilians caricaturists in the first half of the XX century, talking about the singularity of his contribution, at the concern of his black people characters creations and the searching to enlarge the documental, biographic and artistic aspects of his career, analyzing his trajectory in the middle of the artistic environment in Rio de Janeiro, between 1910 and 1940 decades, his intellectual journey. The present research works with au expressive numbers of drawings, produced along this period, showing works of the customs drawings likes the ones The Brunette´s Walks; The Democratic Streetcar; Two Desires, all frow the Cariocas Flagrants series, between others. This researchs will focus either the study of publicity innovations introduced by Seth for Casa Mathias Magazines calendars and posters. The proposition seeks to understand how the artist founded at the civic propaganda in the Vargas govern times, a way to express his nacionalistics believes, in the craddle of the Estado Novo values.