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Hemileuca sp. (probably H. mania)
Large, black Saturniid caterpillar about 4 cm long of the genus Hemileuca. The spines look venomous and are in clusters along the body. The spines are yellow, white and black and the body was speckled with yellow scales.
Found on the ground, very torpid. It must be preparing to pupate. San Cristobal de Las Casas, 2,200 meters.