Prepseudatrichia tiger, Winterton, Shaun L., 2011

Winterton, Shaun L., 2011, New species of Prepseudatrichia Kelsey from Thailand (Diptera, Scenopinidae), ZooKeys 122, pp. 39-44 : 40-42

Prepseudatrichia tiger sp. n. Figs 12

Type material.

Holotype male, THAILAND: Loei Phu Ruea National Park, Nern Wibaak ditch, 17°29.907'N, 101°20.483'E, 1196m, Malaise trap 26.ii-2.iii.2007, Patikhom Tumtip leg. T1714 (QSBG).

Diagnosis.

Male abdomen with white bands on segments 3-4; antenna yellow-brown; thorax glossy black with metallic iridescence; femora brown; hypandrial lobes with triangular processes extending posteriorly to apex on epandrial lobes; hypoproct narrow, extending beyond epandrial lobes.

Description.

Male. Body length: 4.1 mm (female unknown). Head. Glossy brown-black (Fig. 1); frons not protruding anteriorly beyond eye in profile (Fig. 2a), eyes almost contiguous at narrowest point; face brown-black, parafacia narrow, glabrous; mouthparts brown; antenna yellow-brown, overlain with greyish pubescence, admixed with few short setae on outer surface of scape and pedicel, style subterminal; ocellar tubercle raised, broad; postocular ridge very narrow, with few minute setae laterally; occiput relatively flat to concave, pale pubescent medially; gena sparsely covered with fine yellowish setae. Thorax. Glossy brown-black with metallic iridescence, scutum finely rugose to scrobiculate posteromedially, very sparsely overlain with short pale setae; postpronotal lobe and postalar ridge pale tan; pleuron smooth and polished, except for a few sparse fine setae; coxae and femora brown; tibia brown basally, dark-yellow apically; sparse, short setae on legs; haltere dark brown; wing hyaline; venation typical for genus, dark yellow. Abdomen. Glossy brown, cylindrical, glabrous; dorsal surface flattened with dark, alveolate texture resembling elongate honeycomb; intersegmental membranes and posterior margins of tergites 3-4 bright white; tergite 2 sensory setal region as two circular patches. Male genitalia (Fig. 2 B–C). Epandrial lobes scoop-like, not enclosing gonocoxites, elongate setae apically, microtrichia posteromedially; cerci narrow; hypoproct relatively large, narrow, extending beyond cerci posteriorly; gonocoxite triangular in shape; gonostylus well developed with spinose ridge posteriorly, articulated on gonocoxite basally; gonocoxal apodeme relatively narrow; hypandrial lobes membranous, elongate with irregular posteromedial margin, lobes articulated ventrally on gonocoxites; aedeagus extended anteriorly well beyond genitalic capsule; distiphallus trifid, curved, not extending beyond genitalic capsule; lateral aedeagal bulbs well developed either side of basiphallus; ventral apodeme of parameral sheath greatly enlarged, arms flanking aedeagus anteriorly with brace-like flanges; dorsal apodeme small, dark sclerotized as brace between gonocoxal apodemes; ejaculatory apodeme relatively large spatulate, directed ventrally from bulbous basiphallus.

Etymology.

The species epithet is derived from the acronym for the Thailand Inventory Group for Entomological Research (TIGER) project, from which this species was discovered.

Comments.

This species is known only from a single male specimen collected in Thailand. This represents a considerable range extension for the genus, into the Oriental Region, as Prepseudatrichia was previously only known from few species in the Palaearctic and Afrotropical regions. This distinctive species is differentiated from other species in the genus by the shape of the male genitalia, the white bands on the abdomen and dark femora color.