Notes on Dichotomius eucranioides Pereira & D’Andretta

Since the time of its description (Pereira & D’Andretta 1955), D. eucranioides has maintained a doubtful position within the subgenus Luederwaldtinia . Pereira & D’Andretta (1955) did not assign this species to a species group but Vulcano et al. (1967) later placed it in the D. assifer species group due the presence of a transversal carina on the head of males. However, we believe that D. eucranioides should be considered to be in its own species group within the subgenus for the following reasons: it is the only species in the genus that has a crenulate clypeal margin (Fig. 2 A); the transversal carina width on the head is subequal to the distance between the eyes and is greater than its height; the pronotal disc of males is anteriorly delimited by four gibbosities; the pronotal declivity of males has two lateral depressions filled with ocellate punctures; and, contrary to the species of D. assifer species group, D. eucranioides hypomeron do not have an anterior excavation delimited medially by a dense brush of red setae. Although D. eucranioides is a brachypterous species, we decided not to redescribe herein since the descriptions of the female (holotype, Pereira & D’Andretta 1955) and of the male (Vulcano et al. 1976) are detailed enough.