Ophiogomphus caudoforcipus Yousuf & Yunus, 1977, is only known from a single male collected on 04-viii-1966 at Mingora (Pakistan). Based on a comparison between the description and material of O. reductus at the RMNH it is concluded that O. caudoforcipus is a junior synonym of O. reductus.

No new information on Pseudagrion bidentatum has been published since its original description by Morton in 1907 based on a single male from western India. Although this species was already regarded as a synonym of either P. hypermelas Selys, 1876, or P. spencei Fraser, 1922, by Fraser in 1933 it was still treated as a valid species on later checklists. Based on a study of the original description and the holotype held at the National Scottish Museum, Edinburgh, we conclude that P. bidentatum is a junior synonym of P. hypermelas.

Four species of Orthemis are now known to form nocturnal roosting aggregations in Costa Rica, Panama, and Ecuador. A survey of 2 764 observational records from Costa Rica and Panama in iNaturalist revealed 9 communal roosts among 388 records of Orthemis but no such roosts in 2 376 records of 26 other libellulid genera. Additional unpublished photos add three more communal roosts in Orthemis.

Orthetrum ransonnetii is a recent addition to the fauna of Fuerteventura, Canary Islands, but its status on the island has remained unclear. In this study evidence is provided that in the past few years the species has established a resident population there. Further expansion of the species in the Canarian archipelago can be expected.

The genus Tyriobapta Kirby, 1889, includes three species, all originally described from Borneo. The genotype, T. torrida is common in much of Sundaland where it inhabits a variety of standing and slowly flowing freshwater habitats in forest. The two other species, T. kuekenthali (Karsch, 1900) and T. laidlawi Ris, 1919, are much less often encountered. Recent literature has confused these two species, with their identities being reversed, as is clearly evinced by the original descriptions. This note remedies this misconception.

The Madagascar dragonfly fauna remains poorly documented. We list dragonfly observations from two Rapid Biodiversity Surveys in Mahajanga Province, northern Madagascar. Surveyed sites include a coastal area with several lakes close to Mariarano sampled in 2016 and a montane forested area with isolated forest patches in the Mahimoborondro and Bemanevika protected areas in north-central Madagascar close to Bealalana sampled in 2019. A total of 40 species were collected with observations made on three species IUCN listed as data deficient: Tatocnemis sinuatipennis, Neodythemis cf. trinervulata, and Pseudagrion simile.