A new species, Sophianus palawanensis sp. nov. (Hemiptera, Heteroptera, Miridae, Sophianini) is described from the Palawan Island in the Philippines. Photographs of the male habitus and genital structures, as well as detailed SEM micrographs of selected morphological structures, are presented. Trichobothrial patterns of Sophianini and their importance for the hypothesizing relationships within Isometopinae are discussed.

A comprehensive synopsis of isometopine plant bugs, highlighting the thirty-year progress made with information on morphology, biology and zoogeography of extant and extinct taxa, is introduced. In addition, the feeding habit of isometopines is suggested to be at least partially spent as a lichen feeder. A total of 289 Isometopinae species are presented in the world checklist with the zoogeographical information. The direction of further studies on isometopine taxa is also suggested.

The new genus Megalofaciatus gen. nov. represented by two new species M. foliotibialis Taszakowski, Kim & Herczek sp. nov. (the type species) and M. gibbosus sp. nov. Taszakowski, Kim & Herczek (Hemiptera, Heteroptera, Miridae, Isometopinae, Gigantometopini), is described from Brunei. Photographs of the adult males and genital structures, as well as detailed SEM micrographs, are presented. The first finding of the largely modified leg in Gigantometopini is also reported.

The orthotyline plant bug genera Pseudoloxopidea Yasunaga, 1999 and Pseudoloxops Kirkaldy, 1905 are reported from Vietnam for the first time based on the discovery of two new species Pseudoloxopidea ruberuniformis sp. nov. and Pseudoloxops clavolineatus sp. nov., along with the record of Pseudoloxops lateralis (Poppius, 1915). Detailed descriptions, diagnoses of the species, and a key to Vietnamese species are provided with illustrations and photographs.

A new species of the hyalopepline genus Kosmiomiris is described, Kosmiomiris carvalhoi Kim & Jung sp. nov. Morphological information including diagnoses, descriptions of new species, and re-description of K. rubroornatus and biological notes are presented with photographs. Female genitalia of two species in this genus is described for the first time. A key to the Kosmiomiris species is also provided.

The new isometopine Gigantometopus coronobtectus sp. nov. from Vietnam is described and illustrated. A revised diagnosis of Gigantometopus and detailed information on nymphal morphology based on the last-instar nymph and description of the female genitalia are presented. A key to the species of the genus is provided and the position of G. schuhi is discussed based on the morphology of pronotum and scutellum.