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The Oriental species of the genus Sphegina Meigen, 1822 are revised. The following 43 new species are described: Sphegina (Sphegina) abbreviata sp. nov. (Nepal), S. (S.) angustata sp. nov. (Nepal), S. (Asiosphegina) albolobata sp. nov. (Vietnam), S. (Asiosphegina) amplistylus sp. nov. (Philippines), S. (A.) atrimanus sp. nov. (Vietnam), S. (A.) bifida sp. nov. (Sabah, Malaysia), S. (A.) bracon sp. nov. (Vietnam), S. (A.) brevipilis sp. nov. (China), S. (A.) clavigera sp. nov. (Vietnam), S. (A.) collicola sp. nov. (Malaysia), S. (A.) crinita sp. nov. (Java, Indonesia; Malaysia), S. (A.) dentata sp. nov. (Taiwan), S. (A.) distincta sp. nov. (Vietnam), S. (A.) exilipes sp. nov. (Java, Indonesia), S. (A.) farinosa sp. nov. (Sabah, Malaysia), S. (A.) fimbriata sp. nov. (Thailand), S. (A.) furcillata sp. nov. (Vietnam), S. (A.) ghatsi sp. nov. (India), S. (A.) gigantea sp. nov. (China), S. (A.) granditarsis sp. nov. (China), S. (A.) hamulata sp. nov. (India), S. (A.) hauseri sp. nov. (Nepal), S. (A.) incretonigra sp. nov. (Vietnam), S. (A.) inflata sp. nov. (Philippines), S. (A.) inventum sp. nov. (Sabah, Malaysia), S. (A.) karnataka sp. nov. (India), S. (A.) licina sp. nov. (Thailand), S. (A.) lobulata sp. nov. (Vietnam), S. (A.) lucida sp. nov. (Vietnam), S. (A.) nigrotarsata sp. nov. (Vietnam), S. (A.) nubicola sp. nov. (Thailand), S. (A.) ornata sp. nov. (China), S. (A.) perlobata sp. nov. (Taiwan), S. (A.) plautus sp. nov. (China), S. (A.) prolixa sp. nov. (Malaysia, Thailand), S. (A.) setosa sp. nov. (Nepal, India), S. (A.) spathigera sp. nov. (Philippines), S. (A.) spenceri sp. nov. (Vietnam), S. (A.) strigillata sp. nov. (Vietnam), S. (A.) taiwanensis sp. nov. (Taiwan), S. (A.) umbrosa sp. nov. (China), S. (A.) verrucosa sp. nov. (Vietnam) and S. (A.) vietnamensis sp. nov. (Vietnam). Sphegina. (A.) tenuis Brunetti, 1915 is not a synonym of S. (A.) javana de Meijere, 1914. The males of S. (A.) apicalis Shiraki, 1930, S. (A.) tricoloripes Brunetti, 1915 and S. (A.) varidissima Shiraki, 1930 and the females of S. (A.) achaeta Hippa, van Steenis & Mutin, 2015, S. (A.) index Hippa, van Steenis & Mutin, 2015, S. (A.) mirifica Hippa, van Steenis & Mutin, 2015 and S. (S.) quadriseta Huo & Ren, 2006 are described for the first time. Sphegina (S.) quadriseta is recorded for the first time in the Oriental region. A key to all the Oriental species of Sphegina is provided. The Oriental fauna of Sphegina now comprises 94 species.
The first Oriental species of the genus Trichopsomyia Williston, 1888, Trichopsomyia pilosa sp. nov. (Java), has been discovered and is now described. This Oriental species of Trichopsomyia has several characters strongly differing from the other species within this genus. It is hypothesized that it forms a separate group within Trichopsomyia. One species, Trichopsomyia formiciphila Downes, Skevington & Thompson, 2017, from Australia, is similar to the Oriental species described here, and the group is named after this first described species, hence the formiciphila group. The characters for a future phylogenetic analysis are discussed. The character states of the pilosity of the katepisternum and the shape of the metasternum hitherto used in a phylogenetic analysis of Syrphidae Latreille, 1802 are discussed too.
The species of the Eumerus tricolor species group in Iran are reviewed. Six species new to science are described from Iran, i.e., Eumerus atricolorus Gilasian & van Steenis sp. nov., E. brevipilosus Gilasian & van Steenis sp. nov., E. chekabicus Gilasian & van Steenis sp. nov., E. ovoformus Gilasian & van Steenis sp. nov., E. pilosipedes Gilasian & van Steenis sp. nov. and E. vallicolus Gilasian & van Steenis sp. nov. Three species, E. hissaricus Stackelberg, 1949, E. longitarsis Peck, 1979 and E. richteri Stackelberg, 1960, are newly recorded from Iran. Photographs of the species as well as illustrations of the male genitalia of the new species and closely related species are provided. An identification key to the males of the Iranian Eumerus tricolor species group is presented. A row of long posterodorsal setae on the wing vein costa basally is presented and argued as a new diagnostic morphological character for the entire Eumerus tricolor species group.