Melanostoma, Schiner, 1860

Ramage, Thibault, Charlat, Sylvain & Mengual, Ximo, 2018, Flower flies (Diptera, Syrphidae) of French Polynesia, with the description of two new species, European Journal of Taxonomy 448, pp. 1-37 : 27-29

publication ID	https://doi.org/ 10.5852/ejt.2018.448
publication LSID	lsid:zoobank.org:pub:413AE92E-862A-4879-B72F-1C0DCF1F7240
DOI	https://doi.org/10.5281/zenodo.3815659
persistent identifier	https://treatment.plazi.org/id/FA02BC3C-C97F-FFA4-97F7-FB4C4B22019B
treatment provided by	Valdenar
scientific name	Melanostoma
status

Treatment

Key to Australasian and Oceanian species of Melanostoma View in CoL

1. Face with a distinct tubercle ( Fig. 7C, E View Fig ); male genitalia small ( Fig. 7A, C View Fig )..........................4

– Face with only a trace of a tubercle, almost straight ( Figs 4D View Fig , 7D View Fig , 9A View Fig ); male genitalia greatly enlarged, usually visible externally ( Figs 6G View Fig , 7B, D View Fig , 9B View Fig ).............................................................2

2. Abdominal terga entirely black ( Figs 4A View Fig , 6 View Fig F–G); legs partly black in both male and female ( Figs 4C View Fig , 6 View Fig F–G). Male genitalia: surstylus curved towards dorsal part ( Fig. 9D View Fig ) ( French Polynesia) ................................................................................................... M. polynesiotes View in CoL sp. nov.

– Abdominal terga with large orange or yellow abdominal markings; male abdomen almost entirely orange with apical margins narrowly black and genitalic segments black ( Figs 7B, D View Fig , 9B View Fig ); female abdomen with pairs of large, narrowly separated pale maculae ( Figs 7F View Fig , 8A View Fig ); legs all orange, rarely metatibia with an indistinct medial brown band ( Fig. 7B, E View Fig ). Male genitalia: surstylus curved towards ventral part ( Fig. 9G, I View Fig ).........................................................3

3. Male surstylus club-shaped apically ( Fig. 9I View Fig ). Female: frons extensively pollinose, with two small shiny areas above lunule and ventrad to anterior ocellus; shiny areas do not reach eye margin ( Fig. 8B View Fig ) ( India, Sri Lanka, Thailand, Taiwan, Philippines, Borneo, Java, Central Moluccas: Buru) .................................................. M. univittatum (Wiedemann, 1824) View in CoL

– Male surstylus tapers to slender acute apex ( Fig. 9G View Fig ). Female: frons mainly shiny with two large lateral pollinose maculae; shiny areas reach eye margin ( Fig. 8C View Fig ) (New Guinea, Australia, New Caledonia, Solomons, Fiji, Tonga, Samoa) ....................................... M. apicale Bigot, 1884 View in CoL

4. Abdominal terga with yellow maculae on terga 2–4, sometimes very large, but always with a medial continuous black vitta ( Fig. 7A View Fig ) ( New Zealand) .................... M. fasciatum (Macquart, 1850) View in CoL

– Abdominal terga entirely black, sometimes extensively dark pollinose (New Guinea) ................. ....................................................................................................... M. fumivenosum Doesburg, 1966 View in CoL