Aradidae from Vietnam IV. Review of the Oriental flat bug genus Lissonotocoris Usinger & Matsuda, 1959 (Hemiptera: Heteroptera: Aradidae).

To date, only the type species Lissonotocoris membranaceus Usinger & Matsuda 1959 is known and recorded from Vietnam and China, Hainan Island. Four new species of the previously monotypic genus Lissonotocoris are described and figured: loebli n.sp. (Thailand), glabronotus n.sp. (N.Vietnam), pachycerus n.sp. (Malaysia) and siamensis n.sp. (Thailand). A key for the identification of all 5 species is provided.

Flexitibia, a new genus of Harpactorinae (Hemiptera: Heteroptera: Reduviidae), with a discussion on the functional morphology of forelegs of the related genera.

Flexitibia, a new genus, in the division Euagorasaria of the assassin bug subfamily Harpactorinae from Yunnan Province of China is described. The type species, Flexitibia orientalis sp. nov., is described and illustrated. A key to the closely related genera is provided. The type specimens are kept in the Entomological Museum of China Agricultural University, Beijing.

Aradidae from Vietnam III. Trichosomaptera gibbosa n.gen., n.sp., an apterous Carventinae (Hemiptera: Heteroptera: Aradidae) .

A new apterous flat bug genus of the subfamily Carventinae, Trichosomaptera n.gen., is described and illustrated to accommodate gibbosa n. sp. from Vietnam. The species could not be placed in any known genus.