Xenobolus carnifex is a species of spirobolidan millipede found in South India and Sri Lanka. It is a common species and can become a household pest, infesting and damaging thatched roofs, creating a "continual shower of faecal pellets", and invading food and water supplies. X. carnifex ranges from 58 to 65 mm (2.3 to 2.6 in) in length, with 48 to 50 body segments. The body color is dark or black, with a band of red or pink running down the dorsal midline.