The first record of Chlorophanus caudatus Fåhraeus, 1840 (Curculionidae: Entiminae, Tanymecini) from Western Siberia (Altaiskii Krai) is given. It is the most north-eastern find of this species. The new synonym, Chlorophanus caudatus var. simulans Faust 1897, syn. nov. to Chlorophanus caudatus, is established. The distribution map, illustrations and redescription of Chlorophanus caudatus are presented.

Styphlus (Styphlomimus) orthochaetinus (Reitter, 1916), comb. and placem. nov. is redescribed and illustrated. The species was transferred from the genus Pseudostyphlus Tournier, 1874 to the genus Styphlus Schoenherr, 1826. Key for S. orthochaetinus and similar species and distribution map of Styphlomimus subgenus are given.

A new species, Asiodonus lobanovi Legalov & Reshetnikov, sp. nov. from Altai is described and illustrated. It is similar to A. herteshensis (Legalov, 2008) but differs in the scapus not reaching eyes, wider elytral and pronotal scales bifid at apex, more elongated elytra, narrower rostrum, partially reddish-brown antennae, distinctly pointed and curved aedeagus

The first record of Hypophyes hyalinus (Zherichin, 1972) (Brentidae: Nanophyinae: Corimaliini) from Altaiskii Krai is given. It is the most north-eastern find of this species in Siberia. The distribution map, illustrations and redescription of Hypophyes hyalinus are presented.

The first record of Margaritapion nitrariae (Ter-Minassian, 1970) (Brentidae: Apioninae: Aplemonini) from Altaiskii Krai, Western Siberia, Russia is given. It is the most north-eastern find of this species. The redescription of Margaritapion nitrariae is completed. A key for identifying Margaritapion Korotyaev, 1990 and similar genera is given.