CORABECAN, a small group of tribes of South American Indians, regarded on very meagre evidence, as constituting an independent linguistic stock. The Corabecas and other tribes of the group lived in eastern Bolivia on the border of the Chaco, be tween the Lago de la Concepcion in 18° S. lat. eastward toward the Paraguay river. They were an intractable, nomadic hunting folk, who early broke away from the mission of San Rafael and withdrew into the forested country where possibly some remnants may yet survive. Apart from brief references in the mission chronicles, nothing is known in regard to them.