Orestes diabolicus

The species is only known from males, which are unusually prickly for the genus Orestes. These are 40.1 to 41.8 millimetres (1.58 to 1.65 in) and have a solid red-brown color. In addition to the long spines, the relatively long legs are also noticeable, through which Orestes diabolicus can be easily distinguished from the closely related Orestes botot. When compared superficially, the males resemble those of the genus Epidares rather than those of Orestes. The pronotum has a pair of short, but clearly developed spines on the rear edge. According to the acanthotaxy by Philip Edward Bragg in 1998 and 2001, these are the posterior pronatals. In front of it there are four tubercles. On the mesonotum is a pair of long, pointed anterior mesonotals and after about a third a pair of even longer posterior mesonotals at the rear edge. The supra coxals in between on the pleura of the metathorax are barely as long as the anterior mesonotals. The longest and most noticeable spines are the supra coxals on the metapleura. They are aligned horizontally and at right angles to the body. On top of the metanotum is a pair of posterior metanotals that are slightly backward and are similar in length to the posterior mesonotals. On the head the supra antennals are clear, conical, but blunt and slightly directed outwards. The supra occipitals are about the same size as supra antennals. …

The species has so far only been documented from the Lâm Đồng Province in Vietnam, where it was found in the Bidoup Núi Bà National Park.