Sarginae Walker 1834

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 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 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
Published as part of Lessard, Bryan D., Yeates, David K. & Woodley, Norman E., 2020, Review of Australian Sarginae Soldier Fly Genera (Diptera: Stratiomyidae), with First Records of Cephalochrysa, Formosargus and Microchrysa, pp. 23-43 in Records of the Australian Museum 72 (2) on pages 26-27, DOI: 10.3853/j.2201-4349.72.2020.1683, http://zenodo.org/record/4654320
{"references":["James, M. T. 1939. New Formosan Stratiomyidae in the collection of the Deutsches Entomologisches Institut. Arbeiten uber morphologische und taxonomische Entomologie aus Berlin- Dahlem 6: 31 - 37.","Loew, H. 1855. Einige Bemerkungen uber die Gattung Sargus. Verhandlungen des zoologisch-botanischen Vereins in Wien 5: 131 - 148.","Fabricius, J. C. 1798. Supplementum Entomologiae Systematicae. Proft et Storch, Hafniae [= Copenhagen]. [4], 1 - 572. https: // doi. org / 10.5962 / bhl. title. 122153","Kertesz, K. 1912. The Percy Sladen Trust Expedition to the Indian Ocean in 1905, under the leadership of Mr J. Stanley Gardiner, M. A. Volume IV. No. VI. Diptera, Stratiomyiidae. The Transactions of the Linnean Society of London 2 nd Series, Zoology 15: 95 - 99. https: // doi. org / 10.1111 / j. 1096 - 3642.1912. tb 00091. x"]}