Omophorus Schoenherr, 1835

Tseng, Wei-Zhe, Hsiao, Yun & Hsu, Chen-Fu, 2018, Omophorus (Sinomophorus) wallaCei: a new weevil from Borneo highlights the enigmatic Ethiopian-Oriental disjunct distribution (Coleoptera, Curculionidae, Molytinae), Zootaxa 4438 (3), pp. 588-596 : 593

Key to species of genus Omophorus Schoenherr, 1835

1. Vestiture of ventral part bifid; humeral angle obtuse, almost absent.............................................. 7

- Vestiture of ventral part simple; humeral angle present........................................................2

2. Pronotum with paired tubercle dorsally; metatibial uncus present................................................ 3

- Pronotal tubercle absent; metatibial uncus absent............................... O. (Pangomophorus) biroi Voss, 1960

3. Body length less than 7 mm ............................................................................. 4

- Body length more than 7 mm ............................................................................ 5

4. The tubercle of pronotum strongly protruding, with sharp summit; interstria I strongly protruding basally; stria X complete................................................................... O. (Omophorus) indispositus Boheman, 1845

- The tubercle of pronotum moderately protruding, with obtuse and rounded summit; interstria I weakly protruding medially; stria X almost disappear behind the metacoxae......................................... O. (O.) boxi Marshall, 1944

5. Antennae and head reddish brown; scutellum triangular, rounded apically......................................... 6

- Antennae and head black; scutellum cordiform.................................. O. (O.) hacquardi (Chevrolat, 1881)

6. Apical angle of elytra rounded; integument without metallic luster.................. O. (O.) stomachosus Boheman, 1881

- Apical angle of elytra with sharp angle; integument with metallic luster................... O. (O.) cupreus (Pascoe, 1870)

7. Body length less than 6 mm; forehead 0.5 × as wide as rostral apex; rostrum subparallel-sided; antennal club 1.5 × as long as funicle; pronotum conical, slightly bisinuate of lateral margin; tubercle between interstria VII–IX absent; aedeagus length less than 1.5 mm, with sharp apex, pedon straight apically; tegmen with manubrium length equal with parameroid lobes length; body covered with fine grey scales.................................... O. (Sinomophorus) rongshu Wang et al., 2011

- Body length more than 7 mm; forehead 0.8 × as wide as rostral apex; rostrum somewhat broadened basally and apically; shorter antennal club; pronotum subconical, strangled medially, lateral margin strongly bisinuate; tubercle between interstria VII–IX present; aedeagus length more than 1.5 mm, with broader, rounded apex, pedon recurved apically; tegmen with manubrium distinctively longer than parameroid lobes; body covered with fine yellowish brown scales... O. (S.) wallacei sp. nov.