Review of Australian Sarginae Soldier Fly Genera (Diptera: Stratiomyidae), with First Records of Cephalochrysa, Formosargus and Microchrysa Author Lessard, Bryan D. Australian National Insect Collection, National Research Collections Australia, CSIRO, PO Box 1700, Canberra ACT 2601, Australia Author Yeates, David K. Australian National Insect Collection, National Research Collections Australia, CSIRO, PO Box 1700, Canberra ACT 2601, Australia Author Woodley, Norman E. Department of Entomology, Smithsonian Institution, c / o 8920 S Bryerly Ct., Hereford, AZ 85615, United States of America text Records of the Australian Museum 2020 2020-06-24 72 2 23 43 journal article 10.3853/j.2201-4349.72.2020.1683 2201-4349 4654320 184539DF-E8DD-4A48-8E38-70B7860D6134 Key to Australian Sarginae genera 1 Wings with R 2+3 arising proximal to or above r-m ; membranous strap-like lobe absent at base of wings; yellowish brown flies, usually not metallic ................................................................................................................... 2 —— Wings with R 2+3 arising distal to r-m , usually beyond discal cell; membranous strap-like lobe present at base of wings; metallic flies .............................................................................................................................. 3 2 Frons wide and almost parallel in females; face slightly anteroventrally produced to form a small beak-like protuberance visible in profile view; scutum with a distinct black medial vitta; wings with vein M weak and nearly unpigmented between cells br and bm, M 1 and M 3 very weakly developed, M 4 connected to discal cell (i.e. dM 3+4 absent); alula reduced, almost linear ( Fig. 4 ) ..................................................................................... Formosargus James, 1939 —— Upper frons converging ventrally in females; face evenly rounded in profile view; scutum concolorous yellowish brown ( Figs 9 , 10 ) or dully metallic ( P. longipes ; Figs 7 , 8 ), without any distinct markings; wings with vein M noticeably pigmented between cells br and bm , M 1 and M 3 well developed, M 4 separated from discal cell at least slightly by dM 3+4 ; alula large and apically expanded ............................................................................... Ptecticus Loew, 1855 3 Head anteriorly produced in dorsal view, more circular and less than 1.5 times as wide as high in frontal view; occiput narrowly visible in dorsal view, with a prominent, posteriorly projecting fringe of hair-like setae; frons extremely narrow in females (index> 4), narrowly dichoptic in males by width of anterior ocellus; frontal ocellus distant from posterior ocelli, forming an elongated triangle; wings with all medial veins strong; CuA strongly curved, petiole vein CuA+CuP relatively long; apical half of alula set with microtrichia; abdomen slender elongate, about twice as long as wide ( Figs 11–15 ) .............................................. Sargus Fabricius, 1798 —— Head anteroventrally compressed in dorsal view, more than twice as wide as high in frontal view; occiput well developed and visible in dorsal view in females, both sexes without an obvious posteriorly projecting fringe of hair-like setae; frons wide in females (index <2), holoptic in males; ocelli forming an equilateral triangle; wings with at least some faint medial veins; CuA relatively straight, petiole vein CuA+CuP short; surface of alula bare of microtrichia; abdomen short, broad and ovoid, about 1.2–1.4 times as long as wide .......................................................................................... 4 4 Small species (length < 6 mm ); head more rounded in anterior view, about 0.75 times as high as wide; lower frons without distinct triangular callus; wing cell r 1 stained yellow; all medial veins faint ( Figs 5 , 6 ) ........................................................................... Microchrysa Loew, 1855 —— Medium sized species (length ≥ 6 mm ); head dorsoventrally compressed in anterior view, about 0.6 times as high as wide; lower frons with a distinct triangular callus diverging ventrally towards base of antennae; wing cell r 1 stained brown; veins M 2 and M 4 strong ( Fig. 3 ) ................................................................... Cephalochrysa Kertész, 1912