Dichotomius

Arias-Buriticá, Jorge Armando & Vaz-de-Mello, Fernando Z., 2019, Redefinition and taxonomic revision of the “ buqueti ” species-group, Dichotomius Hope, 1838 (Coleoptera: Scarabaeidae: Scarabaeinae), Revista Brasileira de Entomologia 63 (1), pp. 43-52 : 46

Key for the species of the “ buqueti ” species-group and species that may be confused *

1. Males andfemales with calluseson head, elytra andpronotum givingacorrugatedappearance ....................... D. ribeiroi *

- Males and females without calluses on head, elytra and pronotum ................................................................ 2

2. Males and females with elytral striae of one through five widenedinthebasalarea ( Fig. 7A ) .............. D. nutans ( Fig. 7 )

- Malesand femaleswithout widenedelytralstriae ( Figs.5 A–6A) ..................................................................... 3

3. Large size (27–37 mm), elytra withblue overtones. Males with long, acute cephalic lateral processes (2 mm or more), females with fourpointprocess ................................ D. buqueti ( Fig. 5 )

- Medium size (18–28 mm), black elytra. Males with small lateral cephalic processes (less than 1 mm), females with cephalic processsimilartotheprocessesof themale ............. D. haroldi ( Fig. 6 )

Figures

Fig. 7. Dichotomius nutans. (A) Dorsal habitus of the male. (B) Lateral view of aedeagus. (C) Dorsal view of parameres. (D) Ventral view of the parameres. (E) Copulatrix lamellae. (F) Central accessory lamella. (G) Left lateral accessory lamella. (H) Right lateral accessory lamella. (I) Head of female. (J) Thorax of female. Line scale 1 mm.

Fig. 5. Dichotomius buqueti. (A) Dorsal habitus of the male. (B) Lateral view of aedeagus. (C) Dorsal view of parameres. (D) Ventral view of the parameres. (E) Copulatrix lamellae. (F) Central accessory lamella. (G) Left lateral accessory lamella. (H) Right lateral accessory lamella. (I) Head of female. (J) Thorax of female. Line scale 1 mm.

Fig. 6. Dichotomius haroldi. (A) Dorsal habitus of the male. (B) Lateral view of aedeagus. (C) Dorsal view of parameres. (D) Ventral view of the parameres. (E) Copulatrix lamellae. (F) Central accessory lamella. (G) Left lateral accessory lamella. (H) Right lateral accessory lamella. (I) Head of female. (J) Thorax of female. Line scale 1 mm.