Asiobaccha aea Mengual &amp; Thompson, sp. nov.
Creators: name: Mengual, Ximo
Publisher: name: Zenodo
Year: 2016
Subjects: Biodiversity
Taxonomy
Animalia
Arthropoda
Insecta
Diptera
Syrphidae
Asiobaccha
Asiobaccha aea

description: <i>Asiobaccha aea</i> Mengual &amp; Thompson sp. nov. (Figure 3a, b, e) <i>Description</i> <i>Male: Head.</i> Face with distinct round facial tubercle, yellow with some brown lateral areas, black pilose, white-silver pollinose laterally and shiny (bare) medially on tubercle; gena yellow-brown (Figure 3e); lunule dark, yellow basally; frons slightly protruded forward, black, black pilose, brown pollinose laterally and dorsally, shiny basomedially; vertical triangle narrow, black; antenna yellow, black pilose; arista brown, bare; eye bare; occiput black, white-silver pollinose, yellow pilose on ventral 3/4 and dark pilose on dorsal 1/4. <i>Thorax.</i> Scutum black, dark pilose, brown pollinose; mesonotal fringe well defined on anterior part of scutum, with yellow-golden pile; postpronotum black, bare, brown pollinose; postalar callus lighter, tawny; scutellum yellow (tawny), brown pilose, subscutellar fringe absent (Figure 3a, b). Pleuron black, except posterior anepisternum lighter posteriorly as well as katepisternum dorsally and anepimeron, yellow-brown (tawny) pilose, anterior anepisternum with pile on anterodorsal quarter; densely golden pollinose on lighter areas; metaepisternum pilose ventrad to spiracle; metasternum bare; calypter small, reduced, yellow; plumula almost absent, pale; halter pedicel yellow, capitulum dark; posterior spiracular fringes yellow. <i>Wing</i>: entirely microtrichose except posterior margin of alula bare, mostly infuscated, brown with apical margin (beyond vein M2) hyaline. <i>Legs</i>: pro- and mesoleg entirely yellow except dark coxae; metaleg with dark coxae and trochanter; yellow metafemur with an almost imperceptible brown annulus; metatibia dark brown, lighter basally; metatarsus pale (white-yellow), except metabasitarsomere black on basal 2/3 or more. <i>Abdomen.</i> Petiolate, unmargined, mostly black pilose. Tergum 1 black, yellow pilose laterally; tergum 2 tawny, yellowish, darker on posterior 1/4 <i>–</i> 1/5; tergum 3 black with two lateral, square yellow maculae on anterior half of the tergum, reaching anterior and lateral margins; terga 4 and 5 entirely black (Figure 3a, b). Sterna 1 and 2 yellow; sternum 3 yellow on anterior 1/2, black on posterior 1/2; the remainder of sterna black. <i>Female.</i> Similar to male except for normal sexual dimorphism and as follows: face yellow pilose ventrally, frons grey pollinose, and scutellum yellow pilose. <i>Length (N = 1).</i> Body, 15.1 mm; wing, 12.5 mm. <i>Geographical distribution</i> Species known from Solomon Islands. <i>Etymology</i> The name <i>aea</i> is an arbitrary combination of letters and is to be treated as feminine. <i>Differential diagnosis</i> Species with a mesonotal fringe well developed, broad alula and wing entirely microtrichose, which is dark brown even basally with hyaline apical tip. This new species is similar in overall appearance to <i>A. bicolor</i> or <i>A. loriae</i>, but <i>A. aea</i> has an entire microtrichose wing and a mesonotal collar. It can be distinguished from <i>A. nubilipennis</i> and morphologically close species by the wing microtrichia. <i>Type locality</i> Solomon Islands: Malaita Province, Malaita Island, Su <i>’</i> u, 9°04 <i>’</i> 47 <i>’’</i> S, 161°09 <i>’</i> 58 <i>’’</i> E. <i>Material examined</i> <i>Type material.</i> <i>Holotype</i>, male, deposited in the Canadian National Collection (Ottawa, Canada) and labelled: <i>‘</i> Solomon Islands // <i>Malaita Is</i> // <i>Su’ u</i> // <i>16.viii</i>.19 <i>34</i> // H.T.Pagden <i>’</i> [green] <i>‘</i> Frank M.Hull // Collection // C.N.C.1981 <i>’</i>, <i>‘</i> HOLOTYPE // <i>Asiobaccha</i> // <i>aea</i> // <i>des. X. Mengual 2014’</i> [red] (specimen photographed). <i>Paratypes</i>: SOLOMON ISLANDS: Guadalcanal Prov., Honiara, December 1975, N.L.H. Krauss [1&amp;female;, BPBM]; Guadalcanal Prov., Tenaru R, January 1945, G.E. Bohart [1&amp;female;, USNM, USNMENT 00890778]. <i>Remarks</i> The female specimen in the USNM was identified as <i>Episyrphus 74–28</i> Thompson, in litt.
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 2590-2592, DOI: 10.1080/00222933.2016.1206634, http://zenodo.org/record/3994636