Isonychus boliviensis is a species of beetle of the family Scarabaeidae. It is found in Bolivia.
Adults reach a length of about 6.5 mm. They have a brown or blackish-brown, elongate body. The upper surface is covered with grey scales, which are partly lighter, partly darker, so that the upper surface appears more or less mottled. The antennae are yellowish-brown. There is often (but not always) a light midline on the pronotum. On the elytra, either the lighter or darker scales may predominate. The underside is covered with white scales.