Curculionidae (weevils and bark beetles)

When using Duff's key to subfamilies of Curculionidae I have found couplet 26 (where Entiminae splits off) practically impossible to judge. It's worth bearing in mind the majority of Entiminae would hit an obvious dead-end at couplet 27, so when I get to couplet 26 I find it easier to check couplet 27 first and if it fails there assume it's Entiminae.

Subfamily Curculioninae

includes genera Acalyptus, Cionus, Curculio, Dorytomus, Furcipus, Orchestes and Rhamphus

Subfamily Baridinae

includes genus Limnobaris

Subfamily Ceutorhynchinae

includes genera Ceutorhynchus, Nedyus, Parethelcus, Rhinoncus and Trichosirocalus

Subfamily Cossoninae

includes genus Euophryum

Subfamily Entiminae

includes genera Andrion, Attactagenus, Barynotus, Graptus, Liophloeus, Otiorhynchus, Pachyrhinus, Philopedon, Phyllobius, Polydrusus, Sitona and Strophosoma

Subfamily Hyperinae

includes genera Brachypera and Hypera

Subfamily Lixinae

includes genus Rhinocyllus

Subfamily Mesoptiliinae

includes genus Magdalis

Subfamily Scolytinae (bark beetles)

includes genera Hylastes, Hylesinus, Phloeotribus, Pityogenes, Polygraphus, Scolytus and Xyleborinus