Ascopus, Marshall, 1951

Borovec, Roman & Perrin, Hélène, 2019, Systematic position of Ascopus Marshall, Oreosecus Marshall, Perarogula Hoffmann and Rhadinocopes Hustache (Coleoptera: Curculionidae: Entiminae) with description of a new species of Ascopus from Guinea, Zootaxa 4668 (2), pp. 245-257 : 252

Key to species of Ascopus

1. Raised elytral setae on odd intervals denser than on even ones, creating two irregular rows. Funicle segment 6 isodiametric, segment 7 slightly wider than long. Larger species 4.2–4.8 mm .............................. A. lamottei (Hoffmann)

- Raised elytral setae on odd and even intervals equally dense, creating one regular row on each interval. Funicle segments 6 and 7 distinctly wider than long. Smaller species 2.4–3.8 mm ...................................................... 2

2. Protibiae straight. Elytra elongate oval, 1.19–1.26 × as long as wide. Ventral borders of scrobes in dorsal view with small laterally prominent teeth................................................................. A. pyriformis Marshall

- Protibiae apically distinctly inwardly curved. Elytra globular or subglobular, at most 1.12 × as long as wide. Rostrum with straight sides in dorsal view............................................................................. 3

3. Elytra subglobular, 1.08–1.12 × longer than wide, in short distance behind base narrowed. Eyes small, lateral, space between them equal to space between antennal insertions. Rostrum slightly tapered anteriad, at base at most 1.1 × wider than at apex. Pronotum widest at mid-length. Elytral erect setae subspatulate, apically rounded.................... A. girardi sp. nov.

- Elytra globular, at most 1.06 × longer than wide, regularly enlarged posteriad just behind base. Eyes large, subdorsal, space between them slightly narrower than space between antennal insertions. Rostrum distinctly tapered apicad, at base 1.2 × wider than at apex. Pronotum widest at base. Elytral erect setae lanceolate, tip pointed.................................... 4

4. Elytra in lateral view distinctly vaulted just from base; elytra 1.03–1.06 × longer than wide. Pronotum with small lateral projection in the middle. Rostrum longer, at base 1.07–1.14 × as wide as long. Elytral intervals almost flat, 4 × as wide as narrow striae............................................................................. A. curvipes (Hustache)

- Dorsal curvature of elytra almost continuous with that of pronotum; elytra as long as wide to 1.04 × wider than long. Pronotum without lateral projection. Rostrum shorter, at base 1.21–1.28 × as wide as long. Elytral intervals vaulted, 2.5–3 × wider than wide striae........................................................................ A. echinatus (Marshall)