Eopiara sapaensis Gavryushin et Ozerov, sp. n.

https://zoobank.org/NomenclaturalActs/ 4EF3208E-E738-475F-89D6-5DB8D07E3E2B

Figs 8–12, 27–29

MATERIAL. Holotype: ♂, Vietnam: Lào Cai Province, Sin Chai (22.3384ºN, 103.8083ºE), 1400 m, 8. V 2013, coll. T. V. Galinskaya [ZMMU]. Paratypes: same data as holotype but 29.IV 2013, 2♂, 1♀, coll. T. V. Galinskaya; same data as holotype but 2. V 2013, 1♂, 2♀, coll. T. V. Galinskaya; same data as holotype but 3. V 2013, 4♂, 3♀, coll. T. V. Galinskaya; same data as holotype but 8. V 2013, 18♂, 13♀, coll. T. V. Galinskaya; same data as holotype but 21. V 2014, 5♂, 1♀, coll. A.L. Ozerov; Lào Cai Province, Sa Pa env. (22.3866ºN, 103.7868ºE), 1700 m, 23. V 2014, 2♂, 2♀, coll. A.L. Ozerov.

DESCRIPTION. MALE. Head. Frons trapezoidal, subequal to eye width basally, narrowed to two-thirds of eye width apically, subshining reddish yellow, with brownish hairs, posterior margin in some specimens with lateral triangular brownish areas reaching the bases of anterior orbital setae. Ocellar triangle dark brown. Face shiny reddish yellow, parafacialia and genae more yellow, postgenae brownish. Genae about one-sixth height of eye. Face moderately concave, lower facial margin prominent. Prelabrum transverse, shiny reddish yellow, ca. 5 times wider than long, anterior margin straight. Palpi reddish yellow, moderately long, proboscis brown. Two orbital setae, the posterior pair slightly longer; inner vertical setae convergent or parallel; outer vertical setae divergent, slightly longer than posterior orbital setae. Ocellar setae short, divergent; postocellar setae well-developed, divergent, slightly shorter than anterior orbital setae. Genal setae present; postocular setae well-developed, reddish. Antennae reddish yellow with pale yellow pubescence, postpedicel about twice the length of pedicel, arista longer than face, yellow basally, remainder black, moderately long pubescent.

Thorax slightly wider than head, shiny metallic bluish or purplish black with brown tinge (apparently in teneral specimens) which is more evident on postpronotal lobes, anepimera, scutellum, and mediotergite. Scutum covered with reddish brown setae, 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 posterior margin of the sclerite (weak in smaller specimens). Scutellum subpentagonal, weakly convex dorsally, twice as wide as long, posterior margin weakly convex, with two pairs of parallel or weakly divergent scutellar marginal setae, the apical pair one-fourth longer than the basal one.

Legs brown, fore and mid femora with irregular row of posteroventral setae which are longer than width of femora; mid tibiae with one apical spur; all tarsi pale yellowish, tarsomeres 4 reddish brown, tarsomeres 5 more brown, tarsal claws black with reddish bases; knees in some specimens reddish, especially on fore legs.

Wing (Fig. 8) hyaline, iridescent, ca. 2.8 times longer than wide, the widest near middle of cell m 4, restrictedly patterned with brown. Veins yellow, only crossvein h, veins Sc, C and R before tip of vein Sc, basal sections of veins R, M, and CuA brown; wing membrane in all cells with dense, regularly arranged microtrichia. Vein R 1 setose before the point of furcation of radial sector with ca. 20 setae; both sections of vein R 4+5 setose dorsally, the basal section with about five setae, the distal section with ca. 15 progressively shorter setae before the tip of vein R 2+3. Costal fringe shorter than in Eopiara beuki sp.n. Cells bc, c, sc, and base of br brown. A narrow brown discal crossband extends from pterostigma across the point of furcation of radial sector, crossveins r-m, bm-m, m-cu, and over veins CuA and CuA +CuP, almost reaching posterior margin of wing so only the very tip of vein CuA +CuP pale; the band is the widest in cell br before crossvein r-m. Tip of vein R 4+5 with a subtriangular brown spot, infuscation narrowly extending into cell r 2+3 to two-fifths of its width; cell r 4+5 with brown margin, its uniform width about one-half the length of spot on vein R 4+5. Tip of vein Sc nearly opposite the 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 moderately curved upwards distally, cell r 2+3 ca. 3.5 times wider than cell r 4+5. Vein R 4+5 almost straight, vein M 1 subparallel with vein R 4+5. Crossvein r-m subvertical, placed more distad than in Eopiara beuki sp.n., twice its length beyond the base of cell dm; crossvein bm-m oblique, its base far basad of crossvein r-m; crossvein m-cu almost horizontal, slightly shorter than crossvein r-m. Cell dm not widened, longer than cells br, bm, or cua, crossvein dm-m oblique; vein M 4 short, subequal to crossvein r-m. Halteres yellow, stem distally and knob dark brown.

Abdomen ovate, as wide as long, flattened dorsoventrally, shiny metallic bluish black with purple tint, sparcely covered with pale setae, more distinctly on syntergite 1+2. Tergites 3 and 4 about 5 times wider than long; tergite 5 subtriangular, about one and a half times longer than tergite 3 or 4. Male terminalia as in Figs 9, 10, 27–29.

FEMALE. Similar to male. Female terminalia as in Figs 11, 12.

MEASUREMENTS. Wing length, males, 4.7 to 6.0 mm; females, 4.8 to 6.0 mm.

COMPARATIVE NOTES. Eopiara sapaensis sp. n. is superficially very similar to Eopiara beuki sp. n. (see above), evidently a sympatric species, yet, on closer examination, clearly separable from the latter by all wing cells with microtrichia, cell с infuscated, brown discal crossband covering almost all length of vein CuA +CuP, and bicoloured halteres; it also differs in the structure of male and female terminalia.

DISTRIBUTION. Vietnam.

ETYMOLOGY. The species name is a Latinized form of the place name of Sa Pa (Vietnam, Lào Cai Province), a town in which environs the village of Sin Chai, the type locality, is situated.