Eopiara elegans (Frey, 1964)

Figs 19–23, 33–35

MATERIAL. Vietnam: Lào Cai Province, Sa Pa env. (22.3866ºN, 103.7868ºE), 1700 m, 23. V.2014, 2♂, coll. A.L. Ozerov; Lào Cai Province, Sa Pa env. (22.3872ºN, 103.7867ºE), 1682 m, 23. V.2014, 2♂, 2♀, coll. D. Gavryushin.

REDESCRIPTION. MALE. Head. Frons rectangular, one-third longer than wide, subequal to eye width, reddish, with brown hairs. Ocellar triangle black. Face, parafacialia, and genae shiny reddish yellow, with silvery pruinescence, postgenae more yellow. Genae about one-fifth height of eye. Face moderately concave, lower facial margin prominent. Prelabrum transverse, subshining reddish yellow, ca. 5 times wider than long, anterior margin straight. Palpi reddish yellow, moderately long, proboscis yellowish brown. Two orbital setae, the posterior pair longer; inner vertical setae convergent; outer vertical setae divergent, slightly shorter than inner vertical setae. Ocellar setae short, divergent; postocellar setae moderately developed, divergent, subequal to anterior orbital setae. Genal setae present; postocular setae well-developed, pale brownish. Antennae reddish yellow with pale yellow pubescence, postpedicel about twice the length of pedicel, arista longer than face, short pubescent, yellow basally, remainder black.

Thorax wider than head, shiny metallic bluish black with reddish brown tinge (apparently in teneral specimens) which is more evident on postpronotal lobes, notopleural calli, anepimera, scutellum, and mediotergite. Scutum covered with dense yellowish brown setae which are shorter than in E. chrysoptera, scutellum also moderately setose dorsally; mediotergite bare. One postpronotal seta, two notopleural setae, one postsutural supra-alar seta, one inter-alar seta, one postalar seta, one anepisternal seta on the posterior margin of the sclerite. Scutellum subpentagonal, weakly convex dorsally, twice wider than long, posterior margin weakly emarginated, with three or four pairs of scutellar setae of subequal length, the apical pair parallel or weakly convergent, others parallel or slightly divergent.

Legs brown, densely pilose, fore femora and tibiae yellow brown, mid tibiae with distal two-fifth to one-fourth pale yellow; hind tibiae with distal one-sixth to one-fifth pale yellow dorsally, with one apical spur. Hind femora distally with a row of anterodorsal setae which are longer than width of femora. All tarsi pale yellowish, tarsomeres 4 and 5 reddish, tarsal claws black with narrowly reddish bases.

Wing (Fig. 19) hyaline, ca. 2.7 times longer than wide, widest near middle of cell m 4, restrictedly patterned with brown; cells bc, sc, c brownish yellow, the last one brown basally and apically; cell r 1 basally, most of cell r-m, and narrow upper margin of cell cua yellow. Veins yellow, only crossvein h, bases of vein R 2+3 and vein R 4+5, crossvein r-m, crossvein bm-m with adjoining section of M, crossvein m-cu, vein CuA, base of vein CuP, and tip of vein R 2+3 brown; in some specimens crossvein dm-m and vein M 4 weakly infuscated. Veins C and R 1 beyond level of crossvein r-m black. Wing membrane in all cells except for cua with dense regularly arranged microtrichia. Vein R 1 setose before the point of furcation of radial sector with ca. 25 strong setae; both sections of vein R 4+5 setose dorsally, the basal section with ca. 12 setae, the distal portion with ca. 15 progressively shorter setae before the tip of vein R 2+3. Costal fringe relatively short. Cell bc, base and tip of cell c, and narrow base of cell br brownish, most of cell c yellow, most of cell br yellow to paler yellow. A narrow discal crossband runs from pterostigma across the point of furcation of radial sector, in cell r 1 reddish yellow with dark brown margin distally, interrupted at base of cell r 4+5, continued as brown from the middle of cell br, the colour most intense over crossveins bm-m, m-cu, and vein CuA, paler over the basal three-fourths of vein CuA +CuP. Tip of wing with a subtriangular brown spot which is more extensive over tip of vein R 4+5, covering the adjoining area of cell r 2+3, the whole margin of cell r 4+5 also infuscated, including tip of vein M 1 and small portion of cell m 1. Tip of vein Sc near level of crossvein r-m, distal portion of vein R 1 running very close to vein C so cell sc is very narrow. Vein R 2+3 weakly sinuous in some specimens, moderately curved upwards distally, cell r 2+3 ca. 5 times wider than cell r 4+5. Vein R 4+5 almost straight, vein M 1 convergent with vein R 4+5 so cell r 4+5 narrow. Crossvein r-m subvertical, placed far distad, 4 times its length beyond the point of furcation of radial sector, before one-third of cell dm; crossvein bm-m weakly oblique, its base far basad of crossvein rm, almost at level of the point of furcation of radial sector, one-half longer than crossvein rm; crossvein m-cu strongly oblique, subequal to crossvein r-m. Cell dm not widened, longer than cells bm or cua, subequal to cell br, crossvein dm-m oblique; vein M 4 very short, about one-half crossvein r-m. Halteres pale yellow, base of stem reddish.

Abdomen ovate, slightly wider than long, flattened dorsoventrally, shiny metallic purplish black, sparcely covered with pale setae, especially on syntergite 1+2. Tergites 3 and 4 ca. 6 times wider than long; tergite 5 subtriangular, nearly twice as long as tergite 3 or tergite 4. Male terminalia as in Figs 20, 21, 33–35.

MEASUREMENTS.Wing length, males, 8.5 to 9.5 mm; females, 9.0 mm.

FEMALE. Similar to male. Notable differences in leg colouration, with mid and hind femora and tibiae almost uniformly brown. Female terminalia as in Figs 22, 23.

DISTRIBUTION. Myanmar; Vietnam (new record).

COMPARATIVE NOTES. Eopiara elegans is the largest known representative of the genus with wing length up to 9.5 mm. In addition to this, it can be distinguished from E. chrysoptera, apart from structural differences in terminalia, by wing membrane mostly hyaline, cell cua completely devoid of microtrichia, tip of wing with distinct brown subtriangular spot, vein C and closely approximated portion of vein R 1 extensively black, more narrow and broken discal crossband which is paler in upper half of wing, cell br more or less yellow, and legs partially pale in males.