Figure 3 in The evolution of Bolbites onitoides (Coleoptera: Scarabaeidae: Phanaeini): its phylogenetic significance, geographical polychromatism and the subspecies problem

Figure 3. Dorsal sexual monomorphism in Bolbites onitoides. A, frontal view of a male. B, C, head and pronotum: B, male; C, female. Note how little the sexes differ dorsally. Unlike most groups of Phanaeina, males of B. onitoides lack any cephalic or pronotal horns and have a pronotal ridge identical to that of the females. This dorsal monomorphism is in striking contrast with the sexual dimorphism found on the venter. Note, however, the sexually dimorphic extension of iridescence over the clypeus, males having at least its basal half metallic, while females are entirely (or almost entirely) dull black.