Dichotomius (Dichotomius) bos (Blanchard, 1846)

3. Dichotomius (Dichotomius) bos (Blanchard, 1846) View in CoL species group

Diagnosis: The species of the D. bos species group are recognized by the following combination of characters: (1) Medium-sized to large-sized individuals (14–24.7 mm). (2) Head oval, as wide as it is long ( Fig. 8a, b View Figure 8 ). (3) Clypeus without evident clypeal teeth, sometimes inconspicuos ( Fig.8a, b View Figure 8 ). (4) Ventral clypeal process conical with bicuspid tip ( Fig.8a, b View Figure 8 ). (5) Both sexes with conical and directed upward cephalic process in fronto-clypeal area ( Fig. 8a, b View Figure 8 ). (6) Protibial spur not angled or slightly angled near the apex ( Fig. 8d View Figure 8 ). (7) Pronotum with anteriormedial region with a transversal depression and two distinct and obtuse lobes on the superior side ( Fig.8a, b View Figure 8 ). (8) Lateral pronotal foveae circular and deep. (9) pronotal disc with impressed median longitudinal foveae. (10) Striae bicarinate, shallow to distinctly impressed, with shagreened surface and ocellate punctures in its extension. (11) Pygidium with incomplete apical margin and evident punctures ( Fig.8e View Figure 8 ). (12) Aedeagus with subgenital plate ( Fig. 8h View Figure 8 ). (13) Parameres subtriangular in lateral view ( Fig. 8f View Figure 8 ), with very short setae in the apical area ( Fig. 8g, i View Figure 8 ). (14) ME subquadrangular with two extensions on the right and setae present throughout the surface. ( Fig. 8m View Figure 8 ).

Composition: Two valid species: Dichotomius bos (Blanchard, 1846) and D. rugosicollis ( Luederwaldt, 1935) , and one 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 (Cerrado, Caatinga and Chaco provinces), and Paraná dominion (all provinces) ( Fig. 9a View Figure 9 ) .