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The species of the hoverfly genus Paramixogaster Brunetti, 1923 from the Oriental Region are revised. The resulting number of valid species is 15, of which the following four are described as new: P.halmaherensis Reemer, sp. nov. , P.jubata Reemer, sp. nov. , P.kodaiana Sankararaman & Reemer, sp. nov. , and P.sulawesiana Reemer, sp. nov. Three new synonymies are established: Paramicrodondecipiens de Meijere, 1917, syn. nov. is a junior synonym of Microdonvespiformis de Meijere, 1908; Paramixogasterwegneri Keiser, 1964, syn. nov. is a junior synonym of Ceratophyaindica Doleschall, 1857; Microdonsubpetiolatus Thompson, 2020, syn. nov. is a junior synonym of Microdoncontractus Brunetti, 1923. Paramixogasterhuoi Reemer, nom. nov. is introduced as a replacement name for P.trifasciatus Huo & Zhao, 2022, which is a primary homonym of P.trifasciatus Ssymank & Reemer, 2016. Neotypes are designated for Paramixogastericariiformis Pendlebury, 1927 and Myxogastervariegata Sack, 1922, and a lectotype is designated for Microdonvespiformis de Meijere, 1908. An identification key to the species and diagnoses for all species are provided., Competing Interests: The authors have declared that no competing interests exist., (Menno Reemer, Hariharakrishnan Sankararaman.)

Furcantenna malayana sp. nov. is described from Peninsular Malaysia, based on a single female collected in 1962. The other two known species of this genus are also known from single specimens, from Southeastern China and Nepal. A key to the species is given, and the taxonomy and distribution of the genus are discussed., (Menno Reemer.)

The species of the Neotropical hoverfly genus Peradon Reemer, 2013 are revised, based on morphological characters with aid of mitochondrial DNA barcodes. The resulting number of valid species is increased to 31, of which the following seven are described as new: P. ballux Reemer, sp. nov. , P. brevis Reemer, sp. nov. , P. costaricensis Reemer, sp. nov. , P. notialus Reemer, sp. nov. , P. palpator Reemer, sp. nov. , P. pompiloides Reemer, sp. nov. , and P. surinamensis Reemer, sp. nov. Two new synonymies are established: Microdon langi Curran, 1925, syn. nov. and Microdon flavomarginatum Curran, 1925, syn. nov. are both junior synonyms of Mulio bidens Fabricius, 1805. A neotype is designated for Microdon diaphanus Sack, 1921. This neotype, which has been reared from an ant nest, also represents the first case of a larval record for this genus. In some species, most notably in P. bidens (Fabricius) and P. normalis (Curran), discrete and distinct colour morphs are recognized, with strongly differing colouration of wings and abdomen.

With 552 species group names available (excluding misspellings), the Microdontinae constitute the smallest of the three subfamilies of Syrphidae. Paradoxically, this subfamily is taxonomically the least organized of the three: 388 species names were previously classified in a single genus, Microdon Meigen, 1803. The present paper introduces a new generic classification of the Microdontinae, relying partly on the results of phylogenetic analyses of morphological and molecular data as published in other papers, and partly on examination of primary type specimens of 347 taxa, plus additional material, and original descriptions. A total number of 67 genus group names (excluding misspellings) are evaluated, redescribed, diagnosed and discussed, with several implications for their taxonomic status. Of these, 43 names are considered as valid genera, 7 as subgenera, 17 as synonyms. Two generic names (Ceratoconcha Simroth, 1907, Nothomicrodon Wheeler, 1924) are left unplaced, because they are known from immature stages only and cannot be reliably associated with taxa known from adults. The following 10 new genera are described by Reemer: Domodon, Heliodon, Laetodon, Menidon, Mermerizon, Metadon, Peradon, Piruwa, Sulcodon and Thompsodon. A key to all genera, subgenera and species groups is given. A total number of 26 new species are described in the following genera: Archimicrodon Hull, 1945, Ceratrichomyia Séguy, 1951, Domodon, Furcantenna Cheng, 2008, Heliodon, Indascia Keiser, 1958, Kryptopyga Hull, 1944, Masarygus Brèthes. 1908, Mermerizon, Metadon, Microdon, Paramixogaster Brunetti, 1923, Piruwa, Pseudomicrodon Hull, 1937, Rhopalosyrphus Giglio-Tos, 1891, and Thompsodon. New lectotypes are designated for Ceratrichomyia behara Séguy, 1951 and Microdon iheringi Bezzi, 1910. A total number of 267 new combinations of species and genera are proposed. New synonyms are proposed for 19 species group names. Three replacement names are introduced for primary and secondary junior homonyms: Microdon shirakii nom. n. (= Microdon tuberculatus Shiraki, 1968, primary homonym of Microdon tuberculatus de Meijere, 1913), Paramixogaster brunettii nom. n. (= Mixogaster vespiformis Brunetti, 1913, secondary homonym of Microdon vespiformis de Meijere, 1908), Paramixogaster sacki nom. n. (= Myxogaster variegata Sack, 1922, secondary homonym of Ceratophya variegata Walker, 1852). An attempt is made to classify all available species names into (sub)genera and species groups. The resulting classification comprises 454 valid species and 98 synonyms (excluding misspellings), of which 17 valid names and three synonyms are left unplaced. The paper concludes with a discussion on diagnostic characters of Microdontinae.