Asiobaccha bimaculata, comb. nov.
Creators: name: Mengual, Ximo
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Asiobaccha
Asiobaccha bimaculata

description: <i>Asiobaccha bimaculata</i> (Keiser, 1952) comb. nov. (Figure 5a, b, e) <i>Baccha bimaculata</i> Keiser, 1952: 161. Holotype: &amp;female;, NMB. Type locality: Indonesia: Langgai. <i>Baccha</i> (<i>Allobaccha</i>) <i>bimaculata</i> of Knutson et al. 1975: 321. <i>Differential diagnosis</i> Dark species with yellow face and scutellum (Figure 5a, e), with broad alula, and infuscated wing, which is bare basally (including basal part of cell R) (Figure 5b). It has a well-defined mesonotal collar, and the metatarsus is bicolourous (Figure 5a). The most similar species is <i>A. nubilipennis</i>, but <i>A. bimaculata</i> differs from it by having tergum 3 black with two medial subtriangular yellow maculae, pointing anteriorly and not reaching lateral margins (<i>A. nubilipennis</i> has a complete yellow fascia on tergum 3) and the colour of the pleural pollinosity (golden in <i>bimaculata</i> and white-yellow in <i>nubilipennis</i>). Another characteristic to separate both species is the colouration of the metafemur; <i>A. bimaculata</i> has the metafemur dark brown with a yellow apex, while <i>A. nubilipennis</i> has a yellow metafemur with a medial dark annulus. <i>Variation.</i> A paler specimen has metafemur yellow very basally and apically. <i>Length (N = 4).</i> Body, 12.7 <i>–</i> 14.0 (13.2) mm; wing, 10.5 <i>–</i> 12.7 (11.3) mm. <i>Geographical distribution</i> Species known from Sumba Island. <i>Type locality</i> Indonesia: East Nusa Tenggara Province, Pulau Sumba, Sumba Tengah (Central Sumba Regency, Langgai, 10°03’S, 120°28ʹ E. <i>Material examined</i> <i>Type material.</i> <i>Holotype</i>, female, deposited in the Naturhistorisches Museum (Basel, Austria) and labelled: <i>‘</i> TYPUS <i>’</i> [red] <i>‘C.-</i> SUMBA // <i>Langgai</i> // <i>16.7.1949</i> // Expedition // Bühler-Sutter <i>’</i>, <i>‘</i> HOLOTYPE // <i>Asiobaccha</i> // <i>bimaculata</i> // (Keiser) // det. X. Mengual 20 <i>14’</i> [red] (specimen photographed). <i>Paratypes</i>: <i>‘</i> PARA- // TYPUS <i>’</i>, <i>‘C.-</i> SUMBA // <i>Langgaliru</i> // <i>5.10.1949</i> // Expedition // Bühler-Sutter <i>’</i>, <i>‘</i> PARATYPE // <i>Asiobaccha</i> // <i>bimaculata</i> // det. X. Mengual 20 <i>14’</i> [yellow] [1&amp;female;, NMB]; <i>‘</i> PARA- // TYPUS <i>’</i>, <i>‘O.-</i> SUMBA // <i>Lalukku</i> // <i>7.7.1949</i> // Expedition // Bühler-Sutter <i>’</i>, <i>‘</i> PARATYPE // <i>Asiobaccha</i> // <i>bimaculata</i> // det. X. Mengual 20 <i>14’</i> [yellow] [1&amp;female;, NMB]. <i>Nontype material.</i> INDONESIA: East Nusa Tenggara Prov., Sumba, near Lewapaku, km 57 on Waingapu to Waikobubak road, 9 <i>–</i> 12 December 1985, J.D. Weintraub [1&amp;female;, USNM, USNMENT 00890789].
description: Published as part of <i>Mengual, Ximo, 2016, A taxonomic revision of the genus Asiobaccha Violovitsh (Diptera: Syrphidae), pp. 2585-2645 in Journal of Natural History 50</i> on pages 2600-2602, DOI: 10.1080/00222933.2016.1206634, http://zenodo.org/record/3994636
description: {"references": ["Keiser F. 1952. Syrphidae (Dipt.) von Sumba, Sumbawa, Flores und Timor. Wissenschaftliche Ergebnisse der Sumba-Expedition des Museums fur Volkerkunde und des Naturhistorischen Museums in Basel, 1949. Verh Natur Ges Basel. 63: 153 - 175.", "Knutson LV, Thompson FC, Vockeroth JR. 1975. Family Syrphidae. In: Delfinado MD, Hardy DE, editors. A catalog of the Diptera of the Oriental Region, Volume II, Suborder Brachycera through Division Aschiza, Suborder Cyclorrhapha. Honolulu: The University Press of Hawaii; p. 306 - 373."]}