Subgenus Carabomimus Kolbe, 1895
Carabomimus Kolbe, 1895: 57 (type striatulus Chevrolat, 1835)
Blaptosoma (partim) Géhin, 1876: 65 (type laeve Dejean, 1826)
Eutelodontum (partim) Géhin, 1885: 33 (type blaptoides Putzeys, 1845)
Aulacopterum (partim) Géhin, 1885: 34 (type viridisulcatum Chaudoir, 1853)
The mountain species of the Mexican Sierras collected inside of Carabomimus and Calopachys, are characterized by being wingless, by the progressive transformation of the sculpture of elytra, which tends to flatten and simplify its elements, and especially because of the hypertrophic development of ligula of endophallus.
In fact, a different feature of the terminal part of this organ allows to identify the two subgenera. In case of Carabomimus the ligula ends in a slender extension while in Calopachys it ends with a small bulge. However, even without the examination of the male genital organ, the species belonging to Carabomimus, can be distinguished from the ones belonging to Calopachys at first sight, because in the latter the pronotum is markedly narrower behind. Instead in Carabomimus the pronotum is transverse with evenly arcuate sides or straighter behind.
Shortly after the general revision of Jeannel (1940), Gidaspow (1959) again reviewed the matter, re-evaluating or interpreting differently some of the entities previously described. But it seems not to be confirmed, at least as a general rule, the sympatry on which she based her review. Although a partially overlapping of some species cannot be excluded a priori, it seems more likely that the different species have evolved as geographic isolates on the high altitudes of the volcanic massifs of central Mexico ("Transvolcanic Sierra " of Ball, 1970) and their distribution areas still remain separate. Recently, partial revisions or additional descriptions of species or subspecies have been made by various authors. In particular, Lassalle (2009) and Lassalle & van den Berghe (2011), based on new findings and on the review of the historical material, did much to clarify the relationships between the various entities related to this difficult and still little known subgenus.