The genus Planaeschna McLachlan, 1895 and its subgroupings in Vietnam, with descriptions of three new species (Odonata: Aeshnidae).

Twelve Planaeschna McLachlan, 1895 species recorded in Vietnam are presented and their subgroupings based on nuclear DNA analysis are discussed. Three new species are described (Planaeschna crux sp. nov.

Description of Chlorogomphus danhkyi sp. nov. from Vu Quang National Park, central Vietnam with notes on other congeners from the Park (Odonata: Chlorogomphidae).

Chlorogomphus danhkyi sp. nov. (Holotype ♂: Khe Ro, Vu Quang National Park, Ha Tinh Province, 15.

A new species of the genus (Coleoptera, Hydraenidae) from the Ogasawara Islands, Japan, with a description of the larva.

A new species of the genus , O. (O.) sasakii, is described from the Ogasawara Islands, Japan, with a description of the larva.

A new species of Heliogomphus from Vietnam (Odonata: Gomphidae).

Heliogomphus bidentatus sp. nov. (holotype male: Tam Dao National Park, Vinh Phuc Prov.

Chlorogomphus canhvang sp. nov. from Central Vietnam (Odonata: Chlorogomphidae).

Chlorogomphus canhvang sp. nov. [holotype male: Along QL15, Quang Binh Province (appr.

A synopsis of the Euphaeidae (Odonata: Zygoptera) of Vietnam, with descriptions of two new species of Euphaea.

23 species of Euphaeidae (Odonata: Zygoptera) are reported from Vietnam including two new species of Euphaea, E. saola Phan Hayashi, sp. nov.

Description of two new from Vietnam and central Laos with notes on their congeners in Vietnam (Odonata: Platycnemididae).

Descriptions are given of two new species of Calicnemia: C. akahara sp. nov.