I was saddened to hear that Adolfo Constenla Umaña recently passed away. Constenla was a giant in Costa Rican linguistics, doing important work on Chibchan languages and training students who also advanced our understanding of the family. Constenla was also the author of an important book that deserves to be better known than it is, Las lenguas del area intermedia: Introducción a su estudio areal. Among other things, this work evaluates whether the ‘area intermedia’, roughly the region south of the Mayan zone in Meso-America, and extending to northern Colombian Andes, constitutes a linguistic area. This study prefigures by almost two decades the increasingly common use of a relatively large number of typological features to assess areality, and carefully examines the distribution of diagnostic features outside the proposed area, as well as inside, an important methodological point not always attended to in older work on linguistic areas. In many respects this work represented one of the most rigorous studies of a linguistic area until recently, when computational techniques were harnessed to assess areality. Constenla left behind a rich body of work and a cadre of students, through which his influence will live on.