Macrocis diabolicus is a species of beetle of the family Ciidae. It is found in Colombia.
Description Adults reach a length of about . The body is convex and elongated with the dorsal vestiture consisting of long and slender greyish setae. The pronotum has coarse and single punctation, the punctures being very close to each other and the pronotum surface between the punctures is smooth. The lateral margins are explanate, crenulated and visible for their entire lengths from above. The elytral punctation is dual and not seriate.
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