Imeria (Imeria) orientalis, Riedel & C, 2025

Imeria (Imeria) orientalis nov.sp. ( figs 1 View Figs 1-2 , 10 View Figs 5-10 , 22 View Figs 17-22 , 35, 40, 45)

H o l o t y p e ♀: Malaysia: Ng. Sembila, Pasoh foresi, N 2.97, E 102.30, 80 m, 10-21.VI.2013, E. Jenek (Linz).

P a r a t y p e s: (³) China: Hainan Island, Nam-lin-tin, Lam-wan-tung, Kiung-chow district , July 29- 30, 1935, F.K. To (HK); (♀) S. Vietnam: Dong Nai, Cat Tien N.P., c. 100 m, Ficus trail, Malaise traps 1-8, 1-9.x.2005, C. van Achterberg & R. deVries (Leiden); (♀) Cambodia: Sien Reap Prov., Phnom Kulen N.P., Forest around Phum Preah Thom , day collection, 26-27.vii.2006, leg. K. Smets, Youl & D. Jump, Coll. I. R. Sc. N.B. (HK); (♀) Cambodia: Sien Reap Prov. , Prean Khan Temples, Malaise trap, 2006, leg. O. Yothin, I. R. Sc.N.B. (HK); (³) Thailand: Nakhon Ratchasima prov., Pak Chong district, Khao Yai National Park , 7.xi.2018, N. Tharantnanephong (coll. Riedel) .

D e s c r i p t i o n: ♀. Body length 9.0- 10.7 mm. Flagellum with 39-41 segments, moderately lanceolate; 1 st flagellar segment 3.3-3.8× as long as wide, widest segments 1.4-1.6× as wide as long. Temple long, slightly and roundly narrowed behind eye. OED 1.5-2.2 × and OOD 0.7-1.0 × ocellar diameter. Temple and gena almost smooth. Frons sometimes with sparse punctures laterally. Face densely or rather densely punctate. Clypeus large, flat, with fine sparse punctures; apical margin slightly lamelliform raised laterally and with tooth medially. Malar space 0.8× as long as width of mandibular base.

Epomia long and almost reaching ventral margin of pronotum. Mesoscutum densely rugose-punctate, dull. Notaulus not impressed but sometimes indicated by oblique ridges. Epicnemial carina ± widened behind fore coxa. Sternaulus distinctly impressed in frontal 0.4-0.5 of mesopleuron. Mesopleuron striate dorsally and rugose-punctate ventrally, sometimes ± striate ventro-posteriorly. Speculum partly smooth. Metapleuron rugose-striate; juxtacoxal carina present in frontal third to half of metapleuron. Scutellum pyramidal, 1.3-1.4× as wide as long, punctate, apical margin striate, with complete lamelliform lateral carina. Postscutellum finely striate. Propodeum incompletely carinated, almost smooth basally and rugose in apical 2/3, and without or with weak stout apophysis; spiracle oval. Area basalis replaced by median longitudinal ridge. Area superomedia pentagonal, 1.2-1.5× as wide as long; costula reaching its middle. Lateral carina of area petiolaris and lateral longitudinal carina of propodeum absent. Hind coxa densely punctate, without scopa. Hind femur 3.5-4.1× as long as wide. Claws simple, strongly curved apically (by 90°). Areolet pentagonal; frontal distance between veins 2rs-m and 3rs-m 1-2× their width. Vein 1cu-a interstitial or slightly postfurcal.

Metasoma oxypygous, 2 nd to 5 th or 6 th sternites with median folds. Postpetiole moderately widened, finely granulate but shining medially, finely rugose laterally. Gastrocoelus moderately impressed. Thyridium large, transverse, 2.0-2.3× as wide as interval between thyridia. 2 nd tergite about as long as wide. 2 nd tergite finely and densely punctate, with superficial punctures in apical half. 3 rd tergite with superficial punctures, shining. Ovipositor sheath in profile 0.25-0.33× as long as hind tibia.

Color: black. Antenna black; sometimes scape ventrally and basal two flagellomeres ± brownish, flagellar segments 6/7-15 ivory dorsally. Palps, mandible except teeth, clypeus, face except brown median spot, frontal orbit, gena and outer orbit, collar, ventral edge and upper margin or hind edge of pronotum, tegula, subtegular ridge, wide ventral stripe of mesopleuron, scutellum (postscutellum black), metapleuron mainly or entirely, area petiolaris and area posteroexterna, base of petiole, wide basal bands ofn2 nd and 3 rd tergites, sometimes 3 rd tergite only laterally, posterolateral spots or lateral and/or apical margins of 4 th and 5 th tergites, apical band of 6 th tergite and 7 th tergite mainly ivory. Fore and mid coxae and trochanters ivory; hind coxa black, with dorsal and ventral ivory spots. Legs otherwise reddish; fore and mid femora and tibiae sometimes yellowish frontally; mid tarsus brown; hind femur red, black in basal and apical 0.2; hind tibia blackish, sometimes with diffuse reddish-brown subbasal ring; hind tarsus black. Wings hyaline; pterostigma ochreous or brown.

³. Body length 9.0- 10.3 mm. Flagellum with 38-40 segments, bristle-shaped; 1 st flagellar segment 3.6-4.1× as long as wide. Tyloids on flagellar segments 11-18, long-oval, maximally 0.5× as long as their segments, often indistinct. Temple long, slightly widened behind eye, slightly and roundly narrowed apically. OED 2.2-2.3× and OOD 1.0-1.1× ocellar diameter. Temple, frons and gena smooth, with very sparse fine punctures. Face with dense punctures. Clypeus large, flat, with fine very sparse punctures; apical margin slightly lamelliform raised laterally and with median tooth. Malar space 0.8× as long as width of mandibular base.

Epomia very long and almost reaching ventral margin of pronotum. Mesoscutum densely rugose-punctate, dull. Notaulus not impressed. Epicnemial carina slightly widened behind fore coxa. Sternaulus slightly impressed at frontal margin of mesopleuron. Mesopleuron with striation dorsally and striated rugae or striation ventrally. Speculum partly smooth. Metapleuron finely striate; juxtacoxal carina absent or indicated in frontal third of metapleuron. Scutellum almost pyramidal, slightly wider than long, with complete lamelliform lateral carina. Postscutellum with longitudinal striae. Propodeum incompletely carinated, rugose but area externa almost smooth, with weak blunt apophysis; spiracle oval. Area superomedia pentagonal, 1.2-1.4× as wide as long; costula reaching at 4/10 of its length. Lateral carina of area petiolaris and lateral longitudinal carina of propodeum absent. Hind femur 4.0-4.4× as long as wide. Claws simple, apically strongly curved (by 90°). Areolet pentagonal; frontal distance between veins 2rs-m and 3rs-m 2× their width. Vein 1cu-a slightly postfurcal by 1× its width.

Postpetiole moderately widened, with microsculpture but shining. Gastrocoelus moderately impressed, granulate. Thyridium large, transverse, 2.5-2.9× as wide as interval between thyridia. 2 nd tergite 1.0-1.2× as long as wide. 2 nd and 3 rd tergites with fine dense punctures, shining; following tergite finely granulate. Apical margin of hypopygium moderately or tongue-like elongate medially, not pointed.

Color: black, mesosoma sometimes with dark reddish shine. Scape brown, reddish-yellow ventrally. Flagellum black, two basal flagellomeres usually red ventrally, flagellar segments 9/10-15/19 ivory dorsally; tyloids ± yellowish. Palps, mandible except teeth, clypeus, face, frontal orbit, gena and outer orbit, frontal and ventral margins of pronotum, tegula, subtegular ridge, wide ventral band of mesopleuron, often spot onmetasternum, often median spot on mesoscutum, scutellum, often postscutellum, metapleuron apically or almost completely, area petiolaris and area posteroexterna, narrow base of petiole, wide basal bands of 2 nd and 3 rd tergites, lateral margin of 3 rd tergite, narrow apical margins of 3 rd to 6 th tergites, entire 7 th tergite and spot on paramere ivory. Fore and mid coxae and trochanters ivory; hind coxa black or brown, with internal and dorsal ivory spot. Fore and mid femora and tibiae reddish; sometimes basal spot on mid femur, fore and mid tarsi reddish (Vietnamese specimens) or fore tarsus distally and mid tarsus entirely black (Siamese specimen); hind trochanter and trochantellus brown or ± ivory; hind femur red, apically black, sometimes also basally; hind tibia reddish-yellow, basally and apically black; hind tarsus brown or black. Wings hyaline; pterostigma reddish-brown.

R e m a r k: This new species is closely related to Imeria albomaculata but differs constantly by the almost entirely ivory face, entirely yellow metapleuron, black postscutellum, and stouter and large blackish hind femur. In addition, the area dentipara has no dentiform apophysis at the posterolateral edge.

The Vietnamese ♀ which had been mentioned as I. albomaculata in a previous publication ( RIEDEL 2017) belongs to this species.

D i s t r i b u t i o n: Cambodia, China (Hainan Island), Thailand, and Vietnam.