We describe a new species of the rostrata species group of Bolitoglossa (Magnadigita) from a single cloud forest site on the south slope of the Sierra de las Minas in eastern Guatemala, an area of high biodiversity for many groups of organisms. This species is distinguished from other members of the subgenus on the basis of morphology and molecular analyses, and it differs from the sympatric Bolitoglossa helmrichi in ventral coloration of the tail and in foot and body morphology.