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 Allograpta amphotera ( Bezzi, 1928 ) Figs 2A , 3 A–B Xanthogramma amphoterum Bezzi, 1928: 74 ( holotype : ♂, BMNH; type locality: Cook Islands , Rarotonga). Differential diagnosis Species with yellow face with a medial black vitta, scutum black with a continuous lateral yellow vitta from postpronotum to scutellum, scutellum yellow with a median black macula, terga 2 and 5 with two lateral yellow maculae and terga 3 and 4 with a broad yellow fascia. It differs from A. nigripilosa only in the wing microtrichia, as stated in the key. Material examined Holotype FIJI : ♂, “Holo- // type ” [round, red margin], “ Rarotonga 9 // 1920 . // H.W. Simmonds ” “ Xanthogramma // amphoterum // Type Ƌg n.sp .” [red ink], “Fiji Is. // Pres.by // Imp.Bur.Ent. // Brit. Mus . // 1929–1.” ( BMNH ). Paratypes FIJI : 1 ♂, Movua, Nov. 1920 , H.K. Simmonds leg. ( BMNH ); 1 ♀ , Lautoka, Aug. 1919 , R. Veitch leg. ( BMNH ). Other material FRENCH POLYNESIA : 1 ♂, Austral Islands, Rurutu, Mar. 1925 , St. George Expedition ( BMNH ). COOK ISLANDS : 1 ♂, Rarotonga, Avatiu Valley, 28 Mar. 1999 , C. Wilkinson leg. ( BMNH ); 1 ♀ , Rarotonga, Avarua, 0–200 m a.s.l., Nov.–Dec. 1979 , N.L.H. Krauss leg. ( BMNH ). Geographical distribution Cook Islands , Fiji , French Polynesia ( Marquesas Islands (?), Society Islands(?) and Austral Islands), Samoa . Status in French Polynesia Present. Flowers visited No records (ferns?, see Aubertin & Cheesman 1929 ). Genetics There are five DNA barcodes for Fiji specimens of this taxon with the following BOLD Process ID numbers: CNCDB1923-11, CNCDB1924-11, CNCDB1925-11, CNCDB1926-11 and CNCDB1927-11 (all by J.H. Skevington). The Barcode Index Number ( BIN ) for them is BOLD:AAZ6685 (https://doi.org/10.5883/BOLD:AAZ6685). References Aubertin & Cheesman 1929: 172 (records); Hull 1937: 83 (catalogue); Vockeroth 1969: 129 (list); Thompson & Vockeroth 1989: 441 (catalogue); Mengual et al. 2009: 15 (list). Remarks Aubertin & Cheesman (1929) recorded this species for the first time from French Polynesia (Tahiti, Raiatea and Bora-Bora) and mentioned that it was abundant on fern-covered slopes. Hull (1937) listed this species from Fiji , the Marquesas Islands and Tahiti, while Vockeroth (1969) mentioned it from Samoa . We were not able to collect specimens during any field expeditions, even though it might be abundant. The only studied specimen from French Polynesia that has the same wing microtrichia pattern as the holotype of A. amphotera is a male from Rurutu in the BMNH. This species and A. nigripilosa are extremely similar, and after the study of the type material by XM, it is still not clear whether they are the same taxon or two different species, one located in the western and southern parts of the south Pacific Ocean ( A. amphotera ) and the other ( A. nigripilosa ) restricted to the central part. In the BMNH, there is a male ( Cook Islands : Rarotonga, Avatiu Valley, 28 Mar. 1999 , C. Wilkinson leg.) with the cell bm bare on the basal ¼. This male does not match the type of A. amphotera , indicating a potential intraspecific variability or some damage during preservation of this specimen. This specimen might also be a male of A. nigripilosa that reached the Cook Islands , broadening the distribution range of this species. At this point, we should consider the records from French Polynesia by Aubertin & Cheesman (1929) as doubtful, since they were reported prior to the description of A. nigripilosa by Hull (1944) . More specimens are needed to understand the variability of these Oceanic species of Allograpta , but the analysis of the available DNA barcodes, including the specimens of Allograpta from Fiji mentioned above, resolved Fijian and Polynesian specimens in the same cluster, with a bootstrap support value of 100 in the Neighbour-Joining analysis. Moreover, BOLD groups all of these specimens in the same Barcode Index Number (BIN), BOLD:AAZ6685 (https://doi.org/10.5883/BOLD:AAZ6685). Although resolved in the same clade, the barcodes of Fijian and Polynesian specimens form two different clusters. In further studies we will try to collect more individuals of Allograpta to test the molecular variability of these two species; at the current stage, the synonymy of A. amphotera and A. nigripilosa seems plausible.