Tipula (Vestiplex) subcentralis Alexander

Tipula (Vestiplex) subcentralis Alexander

(Figs 1, 24, 107–116; Map 8)

Tipula subcentralis Alexander, 1918: 73; 1925: 92.

Tipula (Vestiplex) subcentralis: Alexander, 1934b: 408; 1935: 118; Savchenko, 1960: 209; 1964: 200; Oosterbroek & Theowald, 1992: 159.

Type material examined. HOLOTYPE ♂: RUSSIA, Kamchatka [date unknown], L. Stejneger.Antenna and wing slide mounted (USNM).

Additional material examined. MONGOLIA. Hovsgol Aimag: 8 ♂, Erdene Bulgan Soum, cold spring on Emt Gol, 33.2 km NW Tarialyn, N49.87742, E101.82073, 1496 m, 13.vii.2005, SRPT, SRP05071302; 1 ♀, Selenge Gol at Teel (beginning of Selenge below confluence of five rivers), N49.26764, E100.82688, 1182 m, 24– 25.vii.2005, SRPT, SRP05072401; 2 ♀, Renchinlhumbe Soum, Jaray (Jarin) Gol (river), 33 km N Renchinlhumbe, 1580 m, N51.39865, E99.75060, 2–3.vii.2006, J.K. Gelhaus #1064, SRP06070203. Khentii Aimag: 1 ♂, 1 ♀, Batshireet Soum, jet Onon Gol, 8 km NE Batshireet, N48.71888, E110.27771, 1080 m, 16.vii.2011, S. Podenas, MAIS2011071602; 2 ♂, 1 ♀, Dadal Soum, Balj Gol, 4.6 km N Dadal, N49.06556, E111.60281, 916 m, 18.vii.2011, S. Podenas, MAIS2011071801; 1 ♂, Dadal Soum, Balj Gol, 5.8 km NE Dadal, N49.05865, E111.56134, 930 m, 19.vii.2011, S. Podenas, MAIS2011071901. Selenge Aimag: 1 ♀, Bugant / Yaroo Soum, Khongiin Gol at Yeroo Gol, confluence, N49.08636, E107.30750, 943 m, 18–19.vii.2003, SRPT, SRP03071803. Tov Aimag: 1 ♂, Erdene Soum, Unnamed river NE Khagiin Har Nuur, Gorkhi Terelj NP, N48.42080, E107.91406, 1818 m, 28.vii.2003, SRPT, SRP03072802.

Elevation range in Mongolia. Adults were collected at altitudes ranging from 900 m to 1600 m.

Period of activity. Adults are active throughout July.

Known distribution. Mongolia (Map 8) and Russia (western and eastern parts of Siberia, Far East).

Redescription. Male. Body length 17.5–23.3 mm, wing length 20.9–21.6 mm. General body coloration brownish yellow.

Head. Brownish yellow, vertex and occiput light gray, pruinose, with brown median line. Rostrum brownish yellow with nasus short and stout. Antenna 13-segmented, if bent backward reaching base of wing. Scape, pedicel and first flagellomeres yellow, succeeding flagellomeres dark brown. Flagellomeres 2–5 yellow dorso-apically, most intensely on second and less intense on succeeding flagellomeres. Each flagellomere except first one with weak basal enlargement and rather deep incision. Apical flagellomere very small, reduced, distinctly shorter than preceding segment. Verticils as long as respective segments. Coloration of palpus varies from light brown to dark brown, depending on specimen, lighter basally turning darker towards distal end.

Thorax. Light brown, densely covered with gray pruinosity. Pronotum grayish with broad brown median line. Prescutum and presutural scutum with 4 longitudinal stripes bordered by brown. Intermediate pair light brown, fused into brown median line. Lateral stripe grayish. Interspace between median and lateral stripes yellowish with light setae arising from dark sockets. Postsutural scutum grayish, scutal lobe with 2 spots bordered by brown. Scutellum and postnotum yellowish, grey polinose with brown median line, covered with sparse long yellow setae. Pleura dull yellow, sparsely dusted with gray. Coxae brownish yellow, sparsely dusted with gray. Trochanters, femora and tibiae brownish yellow. Tarsal segments passing into dark brown. Distal part of femora and tibiae darkened. Tarsal claws without tooth. Wing distinctly patterned with brown. Halter with pale stem and brown knob.

Abdomen. Yellow, with brown interrupted dorsal stripe and indistinct lateral stripe. Posterior and especially lateral margins of tergites pale. Tergite 1 yellow, sparsely dusted, tergites 2–5 yellow, tergites 6–8 passing into brown. Sternites 1–5 yellow, sternites 6–9 passing into brown. Sternite 1 slightly dusted with gray.

Hypopygium. Brown, at base slightly broader than abdomen. Tergite 9 forming large concave crescent sclerotised saucer (Fig. 107). Main body of tergal saucer brownish yellow with blackened rim. Posterior margin of tergal saucer broadly emarginated, with small denticles. Lateral angle of tergal saucer extended into broad obtuse tooth. Anterior and lateral portions of tergal saucer raised into sclerotised border. Border laterally produced into slender acute tooth directed caudad and situated under lateral angle of tergal saucer so that tergite 9 with 2 teeth in lateral view. Gonocoxite unarmed (Fig. 108). Outer gonostylus flattened, widest at middle with apex rounded (Fig. 109). Inner gonostylus large, claw-shaped curved plate with single mid-dorsal tooth or small obtuse projection. Beak extended into blackened rostrum, narrowed subapically (Fig. 110). Gonocoxal fragment large with lateral and medial sclerites well-developed (Fig. 111). Medial sclerites fused, anterior apodeme long and broad, posterior part broadly flattened and arched. Lateral sclerite large and bilobed. Aedeagal guide shaped in long slender tube (Fig. 112). Sperm pump with central vesicle small and flattened (Fig. 113). Compressor apodeme with median incision. Posterior immovable apodeme longer than compressor apodeme, large and extended laterally into broad plate. Anterior immovable apodeme widely rounded, narrowed towards anterior margin. Aedeagus shaped as very long tube, about 16 times as long as sperm pump, basal half dark brown, rest of tube yellow. Distal part ventrally membranous, shovel-shaped.

Female. Body length 26.8–31.2 mm, wing length 22.0–25.0 mm (Fig. 1). Generally similar to male. Antenna short, reaching frontal margin of prescutum if bent posteriorly, flagellomeres cylindrical. Both basal antennomeres yellow, sparsely dusted with gray. Flagellum yellow at base, turning dark brown towards apex.

Ovipositor (Figs 114–116). Tergite 10 shiny brown. Cercus brown, slender, slightly longer than tergite 10, with tip narrowed and curved dorsally, outer margin with indistinct obtuse serration (Fig. 114). Hypovalva in shape of elongated filament, yellow at base, pale apically (Fig. 115). Median incision between hypovalvae slightly deeper than posterior margin of sternite 8. Lateral incision small and wide (depth of incision slightly longer or about same length as maximal width). Lateral angle of sternite 8 rounded. Sternite 9 with anterior part broadened, posterior part short, rounded (Fig. 116). Furca yellowish brown, anteriorly narrowed, posteriorly broad. Bursa copulatrix, with spermathecal ducts sclerotised at base, in shape of lightly curved, slender dark brown process. Wall of bursa copulatrix at connection site with spermathecal ducts partially sclerotised, sclerotisation extended short distance along wall. Cul-de-sac of bursa copulatrix curved. Spermatheca nearly pear-shaped, broadened at base (Fig. 23).