El Lazarillo by Concolorcorvo

Kline, Walter D. (translator), El Lazarillo: A Guide for Inexperienced Travelers between Buenos Aires and Lima, 1773 by Concolorcorvo, Bloomington: Indiana University Press, 1965.

From the book jacket:

Available here in its first English translation, El Lazarillo de Ciegos Caminantes relates the humorous experiences and encounters of an inspector of the postal routes between Buenos Aires and Lima during the late eighteenth century. Called "one of the liveliest narratives of the Colonial period," El Lazarillo contains many elements of the picaresque genre, while numerous passages presage the regionalism of nineteenth-century writers.

From the Foreword by Irving A. Leonard:

The literary products of the former possessions of Spain in the New World far exceeded in quantity and quality those of the Atlantic colonies of England in North America. No British historian of English letters is likely to include any prose or versified work composed in the former American dependencies as a significant - much less classic - contribution to the literature of the mother country. Chroniclers of Castilian literary expression, on the other hand, whether Spanish or Spanish American, are pleased and even proud to recognize many works created in the former overseas realms of Spain as worthy elements of the great patrimony of Spanish genius.