Subgenus Calopachys Haury, 1880
Calopachys Haury, 1880: 164 (type viridissimus Haury, 1880)
Eutelodontus (partim) Géhin, 1885: 33 (type blaptoides Putzeys, 1845)
The mountain species of the Mexican Sierras collected inside of Calopachys and Carabomimus, are characterized by being wingless, by the evolution of sculpture of elytra, and especially by the development of ligule of copulatory organ.
The species belonging to Calopachis, can be distinguished at first sight, because the pronotum is always narrower in the posterior part and the elytra are elongated with strongly rounded humeri. Moreover, in the males, the ligule is long, thin, and its apex seems to have almost the shape of a round or oval botton.
The subgenus includes three species (blaptoides, omiltemium, viridissimum), all of which are found in the southern Mexican Sierra (Oaxacan Sierra, as defined by Ball, 1970) and one more northern species (bulleri) whose placement, however, is not yet certain.