Dichotomius (Dichotomius) depressicollis ( Harold, 1867 )

7. Dichotomius (Dichotomius) depressicollis ( Harold, 1867) View in CoL species group

Diagnosis: The species of the D. depressicollis species group is recognized by the following combination of characters: (1) Medium-sized to large-sized individuals (17.4–27.3 mm). (2) Head oval as long as it is wide ( Fig. 14a, b View Figure 14 ). (3) Clypeus without clypeal teeth and with strong and well-defined transverse wrinkles ( Fig. 14a, b View Figure 14 ). (4) Ventral clypeal process conical with obtuse to acute tip ( Fig.14c View Figure 14 ). (5) Both sexes with bidentate head process, in males located in the clypeal region and in females in the fronto-clypeal region ( Fig. 14a, b View Figure 14 ). (6) Protibial spur abruptly angle downward near the apex ( Fig. 14d View Figure 14 ). (7) Males and females with excavated pronotum in anterior third, with pronotal disc with a big central lobe as wide as the head, with triangular to rounded shape, the lobe continues on each side to the lateral region where it forms two minor processes over the lateral fovea ( Fig. 14a, b View Figure 14 ). (8) Media-lateral fovea elongated and deep, limited with two sinuous subparallel carinae ( Fig. 14j View Figure 14 ). (9) Elytral striae bicarinate, shallow to distinctly impressed. (10) Pygidium with incomplete apical margin and evident puncture ( Fig. 14e View Figure 14 ). (11) Aedeagus with subgenital plate ( Fig. 14h View Figure 14 ). (12) Parameres subtriangular in lateral view ( Fig. 14f View Figure 14 ), with short setae in the apical area ( Fig. 14i View Figure 14 ). (13) ME medium to large, subquadrangular with two extensions on the right and setae present throughout the surface ( Fig. 14n View Figure 14 ).

Composition: Three valid species: Dichotomius depressicollis ( Harold, 1867) , D. melzeri ( Luederwaldt, 1922) and D. zikani ( Luederwaldt, 1922) , and five undescribed species.

Geographic distribution: Boreal Brazilian dominion (Pará provinces), South Brazilian dominion (Madeira, Rondônia and Yungas provinces), Chacoan subregion Southeastern Amazonian dominion ( Xingu-Tapajós province ), Chacoan dominion (Caatinga and Cerrado provinces), and Paraná dominion (all provinces) ( Fig. 15a View Figure 15 ) .