Strongylophthalmyia dichroa, Galinskaya, Tatiana V. & Shatalkin, Anatoly I., 2016

Galinskaya, Tatiana V. & Shatalkin, Anatoly I., 2016, Eight new species of Strongylophthalmyia Heller from Vietnam with a key to species from Vietnam and neighbouring countries (Diptera, Strongylophthalmyiidae), ZooKeys 625, pp. 111-142 : 122-123

Taxon classification Animalia Diptera Strongylophthalmyiidae

Strongylophthalmyia dichroa sp. n. Figure 3

Type material.

Holotype: 1 female, Vietnam, Lai Châu Province, Hoáng Liên (22.33788°N, 103.77922°E), 2068 m, 7.V. 2013 (T.V. Galinskaya). ZMUM.

Diagnosis.

This new species belongs to the Strongylophthalmyia crinita species group. Species of this group are characterized by transparent wing, bare arista, yellow legs, mid and hind femora with apical dark brown ring. Within this group the new species is close to species with yellow face and totally black frons. The new species differ from all species of Strongylophthalmyia crinita species group by palpus with character coloration (yellow, darkened in basal half on anterior margin, with some black setulae apically). Among oriental species only Strongylophthalmyia stylocera from Philippines has these characters, but it is a much smaller species, 2.7 mm (4.8 mm in Strongylophthalmyia dichroa ).

Description.

Female.Head black, shining, slightly shorter than height. Frons entirely black, shining; ocellar tubercle slightly shifted towards anterior: the ratio between height of the frons from its anterior margin to hind ocelli and from hind ocelli to vertex or in ner vertical seta equal to 1.1. Occiput black shining, slightly convex. Face very narrow, yellowish, with triangular black spot in lower part, and consequently it seems dark; face with row of short setulae along suture. Parafacial yellow, covered with white tomentum. Basal antennal segments yellow, first flagellomere darkened, rounded, with short yellow dorsal setulae. Arista brown, bare. Mouthparts brown; palpus yellow, darkened in basal half on anterior margin, with some black setulae apically. Chaetotaxy. Three orbital setae, 1 ocellar seta, 1 postocellar seta, 1 inner vertical seta, 1 outer vertical seta, 1 frontal seta.

Thorax black. Basisternum without a pair of yellow spots. Mesonotum slightly matte, clothed with short yellow dense setulae; postpronotum shining, practically bare; pleuron, including region surrounding anterior spiracle black shining, anepisternum with well-developed light or yellowish setulae ventrally near the mid-coxa and posteriorly near the pleural suture; scutellum bare, matte. Legs yellow, mid and hind femora with dark brown preapical ring; hind tibia with traces of darkening in the basal half; last two tarsal segments slightly brownish. Wings transparent; cell r4+5 and posterior border of cell r2+3 slightly smoke-coloured. Vein R2+3 long, its end far beyond the level of dm-cu: section of C between R1 and R2+3 in 1.9 times longer than a projection of a following section (between R2+3 and R4+5). R4+5 and M1+2 nearly parallel apically. Vein M1+2 between r-m and dm-cu approximately 2 times longer than previous one and nearly 1.4 times shorter than ultimate one. Cell bm approximately 0.45 times shorter than discal cell. Calypter dark grey with fan of very long light setulae on margin. Halter with yellowish stem and whitish knob. Chaetotaxy: one very small postpronotal seta, one dorsocentral seta, two notopleural setae, one supraalar seta, one postalar seta, one anepisternal seta, one stout apical scutellar seta. All setae black.

Abdomen shiny black.

Body length 4.8 mm; wing length 4.0 mm.

Male unknown.

Etymology.

The specific name refers to a bi-coloured palpus.