Variations: Jicara Snake, Chocolate Cup Snake, Malinche
Both large and small varieties of the Xicalcoatl, the Aztec “Chocolate Cup Snake”, exist, and may be found in the waterways of Mexico. They are black in color with variegated bellies. When they reach maturity, xicalcoatls develop an excrescence on their backs. This natural growth looks like a jicara (a gourd chocolate cup) down to the last detail, with colorful designs and patterns on its smooth surface.
Xicalcoatls lure humans to their doom by submerging themselves in water and allowing the painted jicara to show above the surface. A passer-by, seeing the chocolate cup seemingly floating on the water, will try to seize it, but their attentions only cause the cup to drift further and further away. When the victim reaches a sufficient depth, the xicalcoatl causes the water to churn and drown the unfortunate chocolate-seeker.
A watered-down version of this tale persists in Mexico in the form of the evil fairy Malinche, who leaves painted chocolate cups in the water to tempt children.
Nuttall, Z. (1895) A Note on Ancient Mexican Folk-lore. The Journal of American Folklore, v. 8, no. 29, pp. 117-129.
Sahagun, B. (1830) Historia General de las Cosas de Nueva España, v. III. Alejandro Valdés, Calle de Santo Domingo, Esquina de Tacuba, Mexico.