The tribe Thoronini Kozlov, 1970 as interpreted here in its broader sense includes also the tribes Pseudanteridini and Tiphodytini as proposed by Kozlov (1970), i.e. the following genera: Thoron Haliday, 1833, Neothoron n. gen., Pseudanteris Fouts, 1927, Thoronella n. gen., Microthoron n. gen., Tanaodytes n. gen., and Tiphodytes Bradley, 1902. The new taxa described are: Neothoron lautus n. gen. and n. sp., Ecuador; Thoronella elegans n. gen. and n. sp., Brazil; Microthoron baeoides n. gen. and n. sp., Malaya; Tanaodytes longipes n. gen. and n. sp., Malaya; Tanaodytes soror n. sp., Ceylon; Tiphodytes godavari n. sp., Nepal; Tiphodytes mymar n. sp., Malaya; Tiphodytes selangor n. sp., Malaya.The genera Thoron, Pseudanteris, and Tiphodytes are recorded for the first time in Canada. The name Calliscelio Ashmead, 1893 is considered a synonym of Calotelea Westwood, 1837 (new synonymy).The species of Thoronini, the biology of which is known, parasitize eggs of water Heteroptera (Gerridae, Nepidae) and it is assumed that most if not all species of this tribe either live in, or are closely associated with, aquatic or semi-aquatic habitats. This is inferred, in the case of species for which definite information is lacking, from the sites in which the adults have been collected, all of which were near water.