Flower flies (Diptera, Syrphidae) of French Polynesia, with the description of two new species Author Ramage, Thibault 8DE31F66-13BF-4516-A205-60F2EA39E3DD 9 Quartier de la Glacière, 29900 Concarneau, France. Laboratoire de Biométrie et Biologie Evolutive, Université de Lyon, CNRS (UMR 5558), Université Lyon 1, 69622 Villeurbanne, France. Zoologisches Forschungsmuseum Alexander Koenig, Leibniz Institut für Biodiversität der Tiere, Adenauerallee 160, D- 53113 Bonn, Germany. thibault.ramage@hotmail.fr Author Charlat, Sylvain A9AE69C2-039D-47FD-9DD2-B34C4363CB71 sylvain.charlat@univ-lyon1.fr Author Mengual, Ximo A509310D-B567-4830-B8A4-BCB139BB8768 x.mengual@leibniz-zfmk.de text European Journal of Taxonomy 2018 2018-07-04 448 1 37 journal article 22322 10.5852/ejt.2018.448 0ba05318-1eec-44bc-8017-b6e2789b4811 3814059 413AE92E-862A-4879-B72F-1C0DCF1F7240 Key to the species of Syrphidae in French Polynesia 1. Postpronotum bare, head posteriorly strongly concave and closely appressed to thorax so that postpronotum is partly or entirely hidden ( Fig. 2 B–C); male abdomen with five unmodified pregenital segments; tergum 5 visible in dorsal view ( Fig. 2 A–D).............................................5 – Postpronotum pilose, head posteriorly less strongly concave so that postpronotum is clearly exposed ( Fig. 5 A–B); male abdomen with four unmodified pregenital segments; tergum 5 usually not visible in dorsal view ( Fig. 5 D–E, G).......................................................................................2 2. Vein R4+5 strongly sinuate ( Fig. 5A ); metafemur with basoventral patch of black setulae ........ ................................................................................................. Palpada vinetorum ( Fabricius, 1798 ) – Vein R4+5 straight or nearly so ( Fig. 5C, E ); metafemur without basoventral patch of black setulae...............................................................................................................................................3 3. Arista plumose ( Fig. 4E ); face with medial and two lateral tubercles ( Fig. 4E ); metafemur not enlarged, without ctenidium; entire body metallic green or purple ( Fig. 4B ) ................................... .......................................................................................................... Ornidia obesa ( Fabricius, 1775 ) – Arista bare ( Fig. 4F ); face carinate ( Fig. 4F ); metafemur greatly enlarged, with a ctenidium on posteroventral half ( Fig. 5 B–E); body coloration mainly black with pale markings ( Fig. 5 B–E, G–H)..................................................................................................................................................4 4. Spurious vein well sclerotized, as distinct as the neighboring R and M veins ( Fig. 5C, G ); ventral surface of metatibia modified, with anteroventral carina forming a prominent lamina in males, less evident in females. Male: terga 2 and 3 with a broad yellow fascia not divided medially ( Fig. 5G ). Female: tergum 4 with a distinct yellow fascia on posterior margin ( Fig. 5D ) .......... ............................................................................................... Syritta aenigmatopatria Hardy, 1964 – Spurious vein not sclerotized, appears as a shadow formed by microtrichia ( Fig. 5B, E ); metatibia without lamina; terga 2 and 3 with a medial black vitta forming two lateral yellow maculae ( Fig. 5E ) ......................................................................... Syritta oceanica Macquart, 1855 5. Face and scutellum entirely black in ground color ( Fig. 4A, D ); metasternum greatly reduced, with deep anterior incision on each side (as in Fig. 9C ) ......... Melanostoma polynesiotes sp. nov. – Face and/or scutellum partially pale in color, usually yellow in ground color ( Figs 3F, H , 6E ); metasternum entire, not reduced.....................................................................................................6 6. Face partly black, usually yellow with a medial black vitta ( Fig. 3B, D, F ); metasternum with at least some pile; abdomen without margin ( Figs 2 A–B, 3A).......................................8 – Face entirely yellow ( Fig. 3H ); metasternum bare; abdomen distinctly marginated on terga 2–5 ( Figs 2D , 3G , 5F )...............................................................................................................................7 7. Katepisternum without a dorsal yellow macula but densely pollinose ( Fig. 5F ); scutellum usually with black and pale pile; male metatrochanter without any process or projection ( Fig. 6B ) .......... ..................................................................................... Simosyrphus grandicornis Macquart, 1842 * – Katepisternum with a dorsal yellow macula ( Fig. 3G ); scutellum with pale pile only; male metatrochanter with a ventral spine-like process or calcar ( Fig. 6A ) .............................................. ............................................................................................... Ischiodon scutellaris ( Fabricius, 1805 ) 8. Scutum and scutellum entirely black ( Figs 2B , 6C ); abdominal terga 3 and 4 black with two small yellow maculae each, close to the lateral margin ( Figs 2B , 6D ) ..... Allograpta jacqi sp. nov. – Scutum black with lateral yellow vitta ( Figs 2A , 3A ) and scutellum yellow with black medial macula ( Fig. 2A, C ); abdominal terga 3 and 4 black with a yellow fascia each ( Figs 2A, C , 3A )...9 9. Wing entirely microtrichose except cell R bare anterior to spurious vein basally; costal cell bare basally, less than 1/5 .................................................... Allograpta amphotera ( Bezzi, 1928 ) – Wing partly bare basomedially, cell BM bare on basal ¼–½ or more, cell R bare anterior to bifurcation; costal cell bare on basal ¼ ..................... Allograpta nigripilosa ( Hull, 1944 )