Empis (Polyblepharis) subdepilis Shamshev

Empis (Polyblepharis) subdepilis Shamshev , sp.n.

Figs 13–16.

TYPE MATERIAL. Holotype, ♂, labelled: [printed in Cyrillic, Russian]: [ RUSSIA, Amurskaya Province] Klimoutsy [51°28′N 127°35′E] Amur obl. [= Amurskaya Province] / 40 km W of Svobodny / Zinovjev 6.vi.[1]958 // oak-larch forest / on flowers of Spirea ( ZISP, INS _DIP_0000630). GoogleMaps

Paratypes. MONGOLIA. Khövsgöl (Hovsgol) aymag [= Khubsugulskiy aymak (province)]: 25 km SSW of Muren ,

23.vii.1975, Nartshuk (1 ♂, ZISP); Chandmani-Ondor Soum // unnamed trib. of Hohoo Gol , N50.66022, E100.73886, elev. 1566 m GoogleMaps , 18.vii.2005, coll. J. Gelhaus #1022; Selenge Proj. SRP#05071802 (3 ♂♂, 2 ♀♀, ANSP and CNC). Töv aymag [=Tsentralny aymak (province)]: Zaysan, southern slope of Bogdo-ula Mt ., 4.vii.1967, Zaitzev (1 ♂, ZISP). RUSSIA. Amurskaya Prov. : same locality and collector as holotype : 25.v.1957 (1 ♀); 30.v.1957 (1 ♀); 1.vi.1957 (1 ♂); 4.vi.1957 (1 ♂, 2 ♀♀); 22.v.1958 (1 ♀); 1.vi.1958 (1 ♂, 1 ♀); 6.vi.1958 (2 ♂♂ (one dissected), 4 ♀♀); 8.vi.1958 (3 ♀♀); 14.vi.195 (1 ♀); 31.vi.1958 (1 ♀); 2.vi.1959 (3 ♀♀); 4.vi.1959 (2 ♂♂); 31.v.1959 (2 ♂♂, 3 ♀♀); 4.vi.1959 (1 ♂, 1 ♀); between rivers Malaya Pera and Bolshoy Ergel , 6.vi.1958, Zinovjev (1 ♀); same locality , 9.vi.1958, Zinovjev (1 ♀). Buryatia: Khamsura village , 7 km S of Zakamensk , 30.vi.1971, V. Richter (1 ♂) ; 40 km N of Terey , 19.vi.1961, L. Zimin (1 ♀). Zabaykalskiy Terr., 1 male, Kyra , 17.vi.1975, V. Richter .

DIAGNOSIS. Mid-sized species (body about 6 mm) with palpus largely yellow; mesoscutum with 4 vittae, presutural acrostichals and dorsocentrals 1–2-serial, hair-like, minute, partly pale; legs largely brownish yellow; laterotergite with black and pale setae. Male: eyes holoptic; abdominal sternite 8 broadly yellow posteriorly. Female: abdominal tergites 1–6 light grey, narrowly brownish anteriorly and posteriorly (dorsal view); all femora and hind tibia with pennate setae.

DESCRIPTION. Male ( Fig. 13). Body length 6.0–6.4 (holotype 6.1) mm; wing length 5.7–5.9 (holotype 5.9) mm. Head black. Head capsule regions mostly densely greyish pruinose; face shiny along lower margin. Eyes holoptic, upper ommatidia enlarged. Frons represented by small subtriangular space below ocellar triangle and larger space above antennae; bare. Face wide, almost parallel-sided, bare. Ocellar triangle with 2 moderately long, fine and several short setae. Occiput with numerous, long, black setae laterally; postoculars moderately long in upper part, very short laterally; postgena bearing numerous pale, long, hair-like setae. Antenna with scape and pedicel brownish, postpedicel and stylus black; scape about 1.5X longer than pedicel, both with short setulae; postpedicel moderately long, nearly 2.5X longer than wide, with straight margins; stylus short, about 1/3 as long as postpedicel. Proboscis moderately long, labrum brownish, nearly 1.5X as long as head height; palpus broadly yellow (brownish to brownish yellow near base), with scattered black setulae.

Thorax black, mostly densely greyish pruinose and black setose; mesoscutum with 4 distinct, broad, brownish vittae (dorsal view). Antepronotum with several strong setae dorsally and some pale, hair-like setae laterally. Postpronotal lobe with 1 long and numerous shorter strong setae, bearing additional pale, hair-like setulae. Proepisternum with numerous long, pale, hair-like setae on lower part (sometimes dark setae present), bare on upper part. Prosternum bare. Mesonotal setae: acrostichals hair-like, minute, sparse, arranged in 2 close irregular rows, partly pale, lacking on prescutellar depression; presutural dorsocentrals arranged in 2 close irregular rows, similar to acrostichals, postsuturals sparse, slightly longer and stronger, 1 pair of prescutellars moderately long; 1 short, presutural intra-alar; 1 moderately long presutural supra-alar, 3 long notopleurals (2 posterior setae longer), 1 moderately long postsutural supra-alar, 1 long and 1 very short postalars, 4 scutellars (apical pair long, lateral pair very short); numerous black and pale setulae present on notopleuron anteriorly (usually mostly pale). Laterotergite with numerous black setae anteriorly (number highly variable) and numerous pale setae posteriorly. Anterior and posterior spiracles pale yellow.

Legs rather long, slender; coxae densely greyish pruinose, remaining podomeres subshiny; mostly black setose. Leg colour: coxae black; trochanters brownish; otherwise legs extensively brownish yellow, fore femur (except extreme apex and base), tibiae in subapical part and tarsi brownish; in paler specimens tibiae almost uniformly brownish yellow and basitarsi brownish yellow in basal part. Fore coxa with numerous, pale, hair-like and several black, strong setae. Femora without whitish pilosity ventrally. Fore femur with short, strong setae in about apical half anteriorly and posteriorly; bearing row of mostly short anteroventral setae and dense, moderately long, rather fine setae posteroventrally. Fore tibia with 3–5 short anterodorsal and 3–5 similar posterodorsal setae. Mid femur with complete rows of short anteroventral and slightly long- er posteroventral spine-like setae; bearing 2–3 short, strong setae near apex anteriorly and posteriorly. Mid tibia with 3–4 short anterodorsal and 3–5 posterodorsal setae; bearing 2–3 less distinct posteroventral setae in apical part. Hind femur almost uniformly slender, only slightly broader than mid femur; with similar setation to mid femur. Hind tibia somewhat gently thickened towards apex; with 5–6 short anterodorsal and 7–8 posterodorsal setae; covered with simple setulae ventrally; 1 short seta in posteroapical comb. Fore and mid tarsomeres 1 slender, hind tarsomere 1 rather slightly thickened; all basitarsi with short, spine-like setae ventrally.

Wing membrane faintly brownish infuscate. Pterostigma brownish yellow, narrow. Basal costal seta absent. Veins R 5 and M 1+2 divergent subapically; radial fork acute. Anal angle very acute, subsequently anal lobe well developed. Calypter yellow, pale fringed. Halter yellow.

Abdomen almost entirely black, sternite 7 brownish yellow posteriorly and sternite 8 extensively yellowish. Pruinescence: in lateral view tergites 1–6 densely light grey pruinose on lower part (concolourous with sternites) and brownish on upper part, in dorsal view tergites 2–7 velvety brown, tergites 6–7 with slightly darker iridescent spots. Chaetotaxy: tergites 1–3 with long, pale setae laterally, tergites 1–6 with strong, black posteromarginal setae laterally, otherwise tergites covered with black setulae; sternites 1–5 with scattered pale setulae, sternites 6–8 with more numerous black setulae, sternite 8 with several moderately long posteromarginal setae. Pregenital segments: segment 6 unmodified; tergite 7 with straight posterior margin, bearing scattered setulae; sternite 7 somewhat broader posteriorly than sternite 6, with simple setae; tergite and sternite of segment 8 separated; tergite 8 divided medially, represented by two small, subtriangular sclerites bearing scattered setulae posteriorly; sternite 8 scoop-shaped, constricted near base, each side close to base with horn-like tubercle and elongate oval projection (ventral view) separated by deep subovate depression.

Hypopygium ( Figs 14, 15) moderately large, largely brownish, epandrial lamella reddish brown on upper part and phallus yellowish; cercus and epandrial lamella with black setulae. Epandrial lamella ( Fig. 14) rather trapezium-like, with scattered short setae on lower part closer to apex. Hypandrium rounded apically, bare. Cercus elongate oval (lateral view), with smoothed inner margin, without dorsolateral projection in basal part (dorsal view). Phallus as in Fig. 15.

Female ( Fig. 16). Body length 5.6–6.1 mm; wing length 6.7– 6.3 mm. Similar to male except as follows. Eyes dichoptic, ommatidia of equal size. Frons broad, parallel-sided, usually bare (sometimes scattered, minute setulae present in lower part). Occiput with sparse setae. Notopleuron with minute, mostly black setulae anteriorly; acrostichals and dorsocentrals slightly stronger, uniformly black. Fore femur with fringe of short pennate setae anterodorsally and longer pennate setae posteroventrally (anterodorsal setae absent close to base). Mid femur with similar fringes of pennate setae as fore femur. Hind femur with fringe of short, pennate setae in about apical 1/3 dorsally; bearing long, pennate, posteroventral setae in about apical 2/3. Fore tibia and tarsus with simple setae. Mid tibia with 3–4 anteroventral and 2–3 posteroventral setae; sometimes bearing scattered, short, slightly flattened setae close to apex ventrally. Hind tibia and hind basitarsus slen- der; hind tibia with short, pennate, anterodorsal setae in apical 1/2–2/3 (in addition to rows of anterodorsal and posterodorsal simple, strong setae); row of short anteroventral setae; bearing moderately long, pennate, posteroventral setae in about apical 3/4. Wing membrane almost hyaline, slightly brownish infuscate at apex. Abdominal tergites 1–6 largely densely light grey pruinose, tergites 2–5 narrowly brownish pruinose anteriorly and posteriorly (dorsal view), sternites 1–6 entirely densely light grey pruinose, segments 7–8 brownish shiny, segment 10 and cercus contrastingly black, subshiny. Abdominal chaetotaxy very reduced, tergites mostly covered with scattered, minute setulae, sternites almost bare; only tergite 1 with numerous, short, black and pale, fine setae. Cercus short, clothed in dense dark setulae.

DIFFERENTIAL DIAGNOSIS. The new species is similar to E. depilis Loew, 1873 known only from the southern steppe areas of European Russia [ Berezhnova, Shamshev, 2006]. The male of E. subdepilis sp.n. can be distinguished from E. depilis by the following characters: acrostichal setae partly pale; presutural dorsocentral setae 2-serial; fore femur covered with dense, moderately long, rather fine setae posteroventrally. In addition, in the female of E. subdepilis sp.n. all femora and hind tibia bear pennate setae. The male of E. depilis has black acrostichal setae; uniserial presutural dorsocentral setae and fore femur with row of short, spine-like, posteroventral setae (longer in about apical half). In the female of E. depilis only mid and hind femora bear short posteroventral pennate setae, hind tibia covered with simple setae.

ETYMOLOGY. The name of the new species refers to its similarity to E. depilis Loew.

DISTRIBUTION. Mongolia, Russia (Amurskaya Province, Buryatia, Zabaykalskiy Territory).

HABITAT AND SEASONAL OCCURRENCE. According to labels data, the species inhabits open biotopes (meadows, steppe areas, glades), from the end of May until the end of June. Several specimens were taken from flowers of Spiraea sericea (= Spiraea media var. sericea (Turcz.) Maxim. ) and one specimen from flowers of an apple.