The Chinese species of the genus Ontsira Cameron (Hymenoptera, Braconidae, Doryctinae)

Abstract The Chinese species of the genus Ontsira Cameron, 1900 (Hymenoptera: Braconidae, Doryctinae) are reviewed. Eleven species are recognized, of which four new species are described from China and South Korea: O. abbreviata sp. n., O. henana sp. n., O. robusta sp. n., and O. rugivertex sp. n. Two species, O. ignea (Ratzeburg) and O. neantica Belokobylskij et Maetô, are recorded in China for the first time. A key to the Asian species of the genus Ontsira is provided.


Review of Chinese species
Ontsira abbreviata sp. n. http://zoobank.org/C79C62F9-32ED-4F77-8457-4B7D1142975D http://species-id.net/wiki/Ontsira_abbreviata Fig. 1 Type material. Holotype: female, China, Shaanxi, Huoditang, 5.VI.1998 (Du Yuzhou), N 982455 (ZJUH). Etymology. From Latin "abbreviatae", meaning "shortened", after the shortened second radiomedial cell of the fore wing Description. Female. Body length 3.0 mm; fore wing length 2.7 mm. Head width 1.6 times as long as its median length, 1.2 times as long as width of mesoscutum. Frons without carina, with distinct elongate pit between antennal sockets. Head behind eyes (dorsal view) regularly roundly narrowed; transverse diameter of eye 1.2 times as long as temple. Ocellar triangle situated behind middle of head (dorsal view), its anterior ocellus situated almost on level of anterior margins of eyes. Ocelli small, in almost equilateral triangle. POL 1.2 times as long as Od, 0.3 times as long as OOL. Eye sparsely and shortly setose, without emargination opposite antennal sockets, 1.2 times as high as broad. Face along eyes without carinae, with small shallow depressions above clypeus; width of face 1.4 times height of eye and 1.4 times height of face and clypeus combined. Diameter of antennal socket almost equal to distance between sockets and distance between socket and eye. Malar suture indistinct. Malar space about 0.6 times height of eye and 0.9 times basal width of mandible. Clypeus with distinct lower flange. Clypeal suture distinct and complete. Hypoclypeal depression oval, its width almost equal to distance from edge of depression to eye, 0.4 times width of face. Occipital carina ventrally fused with hypostomal carina at upper base of mandible. Maxillary palpi long, 1.5 times as long as head height.
Antennae rather slender, filiform, 25-segmented, as long as body. Scape 1.9 times as long as its maximum width. First flagellar segment 5.0 times as long as its apical width, and 1.4 times as long as second segment. Penultimate segment 2.7 times as long as wide, 0.5 times as long as first flagellar segment, and 0.9 times as long as apical segment; the apical segment distinctly pointed apically.
Mesosoma. Length 1.8 times its height. Pronotum not convex dorsally (lateral view), with distinct pronotal carina. Median lobe of mesoscutum (dorsal view) weakly protruding forward, with wide median furrow. Notauli deep, narrow, crenulate-rugulose. Prescutellar depression rather deep, with three median carinae, finely rugulose to smooth between carinae, 0.4 times as long as scutellum. Scutellum convex, without lateral carinae. Metanotum (dorsal view) with two strongly convergent and fused posteriorly lateral carinae, without median carinae; with short and obtuse metanotal tooth. Subalar depression rather shallow, wide, sparsely rugose-striate. Sternaulus deep, straight, finely crenulate, connected with prepectal carina anteriorly, running along anterior 0.6 of the lower part of mesopleuron. Metapleural flange long, wide, rounded apically. Propodeum with short, thick lateral tubercles. Wings. Fore wing 3.1 times as long as maximum width. Radial vein arising weakly behind middle of pterostigma, from its basal 0.55. Radial cell not shortened; metacarp 1.25 times as long as pterostigma. First radial abscissa 0.5 times as long as maximum width of pterostigma. Second radial abscissa 4.5 times as long as first abscissa, 0.5 times as long as the straight third abscissa, and 1.15 times as long as first radiomedial vein. Second radiomedial cell 2.4 times as long as its maximum width, and 1.7 times as long as brachial cell. First medial abscissa weakly sinuate. Mediocubital vein almost straight. Recurrent vein distinctly antefurcal. Distance from nervulus to basal vein about 0.5 times as long as nervulus. Parallel vein arising distinctly behind middle of distal margin of brachial cell. Hind wing 4.5 times as long as maximum width. First costal abscissa 0.7 times as long as second abscissa. First abscissa of mediocubital vein 1.1 times as long as second abscissa. Mediocubital cell large, weakly widened toward apex, 7.0 times as long as wide, and 0.4 times as long as wing. Recurrent vein weakly curved, strongly antefurcal, unsclerotized.
Legs. Fore tibia with rather numerous slender spines arranged in almost single line. Hind coxa without dorsal tooth, 1.6 times as long as wide. Hind femur 4.2 times as long as wide. Hind tarsus 0.9 times as long as hind tibia. Hind basitarsus 0.7 times as long as second-fifth segments combined. Second segment of hind tarsus 0.45 times as long as basitarsus, 1.1 times as long as fifth segment (without pretarsus).
Metasoma about as long as head and mesosoma combined. First tergite with distinct dorsope, with small spiracular tubercles in basal 0.3, rather distinctly and almost linearly widened from base to apex. Maximum width of first tergite about twice its minimum width; length 1.15 times as long as its apical width. Second tergite without basomedian area; length of tergite 0.7 times as long as its basal width, almost equal to length of third tergite. Second suture very shallow and straight. Third tergite without additional transverse furrow. Ovipositor sheath 0.8 times as long as metasoma, as long as mesosoma, and 0.4 times as long as fore wing.
Sculpture and pubescence. Vertex and temple smooth; frons mostly smooth, finely coriaceous anterolaterally; face mostly smooth, finely rugulose-striate on upper part and on clypeus. Sides of pronotum smooth ventrally, coarsely crenulate medially, rugulose dorsally. Mesoscutum densely and distinctly granulate, rugulose anteriorly. Scutellum entirely finely granulate. Mesopleuron mostly smooth. Propodeum with distinctly areas delineated by carinae; basolateral areas large, smooth, but rugose in posterior 0.3 and along carinae; areola long and narrow, twice as long as wide; dorsal carina rather long, about twice as long as areola fork. Hind coxae coarsely striate in dorsal half, finely rugulose to smooth in ventral half. Hind femur smooth. First tergite with high complete subparallel dorsal carinae, rather distinctly striate, but smooth mediobasally (between dorsal carinae) and lateroapically. Second and the following tergites smooth. Vertex with rather sparse, long and semi-erect setae, glabrous in anterior half. Mesoscutum with dense, rather long and semi-erect pale setae, glabrous in rather wide submedian areas on lateral lobes. Hind tibia dorsally with rather long, sparse semi-erect setae basally and densely apically, length of these setae 0.7-1.0 times as long as maximum width of hind tibia.
Male unknown.

Distribution. China (Shaanxi).
Diagnosis. The new species is similar to O. reticulata Cameron (India), but differs in having the second radiomedial cell and the second radial abscissa short, the nervulus postfurcal, the ovipositor shorter, the hind coxa sculptured dorsally, the legs entirely yellow, the first tergite shorter, and the frons with distinct elongate pit between antennal sockets. It also resembles O. gratia Belokobylskij (from Taiwan), but differ in having the parallel vein arising distinctly behind middle of distal margin of brachial cell, the occipital carina fused below with hypostomal carina, the baso lateral areas of propodeum without granulation, the radial vein arising weakly behind middle of pterostigma, and the second radial abscissa and the second radiomedial cell shorter. Remark. The male of O. apposita is recorded for the first time. It differs from females in the following characters: the parallel vein of the fore wing arises slightly behind middle of distal margin of brachial cell, the recurrent vein of fore wing antefurcal, the first abscissa of mediocubital vein of hind wing not shorter than second abscissa, and the acrosternite of first metasomal segment weakly elongate.
Etymology. Named after the locality of the holotype, Henan province. Description. Female. Body length 2.8 mm; fore wing length 2.7 mm. Head width 1.5 times as long as its median length, 1.15 times as long as width of mesoscutum. Frons without carina, with very shallow median furrow. Head behind eyes (dorsal view) regularly roundly narrowed; transverse diameter of eye 1.6 times as long as temple. Ocellar triangle situated on middle of head (dorsal view), its anterior ocellus situated weakly behind middle level of eyes. Ocelli small, in almost equilateral triangle. POL 1.3 times as long as Od, 0.4 times as long as OOL. Eye glabrous, without emargination opposite antennal socket, 1.1 times as high as broad. Face along eyes without carinae, with small shallow elongate depressions above clypeus; width of face 1.4 times as long as height of eye and 1.4 times as long as height of face and clypeus combined. Diameter of antennal socket 1.4 times as long as distance between sockets and 1.4 times as long as distance between socket and eye. Malar suture indistinct. Malar space 0.5 times as long as height of eye and equal to basal width of mandible. Clypeus with distinct lower flange. Clypeal suture distinct and complete. Hypoclypeal depression round, its width 0.8 times as long as distance from edge of depression to eye and 0.35 times as long as width of face. Occipital carina ventrally not fused with hypostomal carina. Maxillary palpi long, 1.4 times as long as head height.
Antennae rather thick, almost filiform, 26-segmented, 1.3 times as long as body. Scape 1.5 times as long as its maximum width. First flagellar segment 4.3 times as long as its apical width, 1.1 times as long as second segment. Penultimate segment 2.5 times as long as wide, 0.5 times as long as first flagellar segment, and 0.9 times as long as apical segment; the apical segment shortly pointed apically.
Mesosoma. Length 1.8 times as long as high. Pronotum not convex dorsally (lateral view), with rather distinct pronotal carina. Median lobe of mesoscutum (dorsal view) not protruding forward, without median furrow. Notauli deep, narrow and distinctly crenulate with rugosity partly. Prescutellar depression rather deep, with three median carinae, entirely rugulose, 0.3 times as long as scutellum. Scutellum convex, without lateral carinae. Metanotum (dorsal view) with two strongly convergent and fused posteriorly lateral carinae and without median carinae; with distinct and pointed metanotal tooth. Subalar depression rather shallow, wide, rugose-reticulate. Sternaulus deep, straight, entirely smooth, connected with prepectal carina anteriorly, running along anterior 0.6 of the lower part of mesopleuron. Metapleural flange long, wide, rounded apically. Propodeum with very short, thick lateral tubercles. Wings. Fore wing 3.0 times as long as its maximum width. Radial vein arising from middle of pterostigma. Radial cell not shortened. Metacarp 1.2 times as long as pterostigma. First radial abscissa 0.8 times as long as maximum width of pterostigma. Second radial abscissa 4.4 times as long as first abscissa, 0.7 times as long as the straight third abscissa and 1.3 times as long as first radiomedial vein. Second radiomedial cell 3.2 times as long as its maximum width, 2.4 times as long as brachial cell. First medial abscissa weakly curved. Mediocubital vein almost straight. Recurrent vein interstitial to first radiomedial vein. Distance from nervulus to basal vein almost equal to nervulus length. Parallel vein arising almost from middle of distal margin of brachial cell. Hind wing 5.0 times as long as its maximum width. First costal abscissa 0.6 times as long as second abscissa. First abscissa of mediocubital vein almost as long as second abscissa. Mediocubital cell large, distinctly widened toward apex, 7.5 times as long as wide, 0.4 times as long as whole length of wing. Recurrent vein straight, weakly antefurcal, unsclerotized.
Legs. Fore tibia with rather numerous slender spines arranged in almost single line. Hind coxa without dorsal tooth, 1.6 times as long as wide. Hind femur 3.6 times as long as wide. Hind tarsus 0.9 times as long as hind tibia. Hind basitarsus 0.6 times as long as second-fifth segments combined. Second segment of hind tarsus 0.6 times as long as basitarsus, 1.6 times as long as fifth segment (without pretarsus).
Metasoma 0.8 times as long as head and mesosoma combined. First tergite with distinct dorsope, without spiracular tubercles, rather weakly and almost linearly widened from base to apex. Maximum width of first tergite about twice its minimum width; length 1.1 times as long as its apical width. Second tergite without basomedian area, 0.7 times as long as its basal width, 1.2 times as long as length of third tergite. Second suture straight and shallow. Third tergite with shallow submedian transverse furrow. Ovipositor sheath 0.7 times as long as metasoma, 0.75 times as long as mesosoma and 0.3 times as long as forewing.
Sculpture and pubescence. Vertex and temple smooth; frons mostly smooth, finely granulate-coriaceous anterolaterally; face finely striate with dense fine granulation between striae, almost smooth laterally. Sides of pronotum entirely coarsely rugose-striate. Mesoscutum densely and coarsely granulate, coarsely rugose in narrow area on medioposterior half. Scutellum entirely densely granulate. Mesopleuron mostly smooth, finely granulate posteriorly. Propodeum with distinctly delineated by carinae areas; basolateral areas large, entirely coarsely granulate, additionally rugulose posteriorly; areola long and rather narrow, 1.7 times as long as wide; dorsal carina long, about 1.7 times as long as areola fork. Hind coxa dorsally coarsely rugose with granulation, densely granulate with fine rugosity laterally, almost smooth ventrally. Hind femur mostly smooth, finely rugulose-granulate dorsally. First tergite entirely densely, coarsely and linearly striate. Second tergite mostly rather finely and densely striate-rugulose, smooth posteriorly. Remaining tergites smooth. Vertex entirely with rather dense, short and semi-erect setae; mesoscutum entirely with dense, short and semi-erect pale setae. Hind tibia dorsally with rather long, very dense and semi-erect setae, length of these setae 0.6-0.8 times maximum width of hind tibia.
Colour. Body dark reddish brown with almost black spots, head brownish yellow below. Antennae brownish yellow in basal half, brown to dark brown in apical half. Palpi pale yellow. Legs yellow or brownish yellow, infuscate distally. Ovipositor sheath black. Fore wing membrane faintly infuscate. Pterostigma brown, yellow in basal 0.3 and apically.
Male unknown.

Distribution. China (Henan).
Diagnosis. This new species is similar to O. eugeniae Belokobylskij (Russian Far East), but differs in having the vertex and most part of frons smooth, the eyes glabrous, the second tergite widely sculptured, the antennal segments slender, the third tergite with transverse furrow, and the vertex and mesoscutum with short setae. It differs from O. gratia Belokobylskij in having the second tergite widely sculptured, the second suture distinct, the third tergite with transverse submedian furrow, the hind femur wider, and the sternaulus smooth. ( : Hellen, 1940: 26;Telenga 1941: 91. Ontsira imperator: Marsh 1973Shenefelt andMarsh 1976: 1324;Belokobylskij and Tobias 1986: 43;Belokobylskij 1998a: 56;Chen and Shi 2004: 29;Yu et al. 2012 Description of male (first record). Body length 3.2-3.8 mm; fore wing length 3.0-3.4 mm. Transverse diameter of eye 0.9-1.0 times as long as temple. Frons mostly smooth. Antennae rather thick, 33-segmented. First flagellar segment 3.2-3.4 times as long as its apical width, 1.1-1.3 times as long as second segment. Prescutellar depression almost smooth, with three carinae. Second radial abscissa of fore wing 2.4-2.6 times as long as first abscissa, 0.4-0.5 times as long as third abscissa. Second radiomedial cell 2.2-2.4 times as long as its maximum width, 1.2-1.3 times as long as brachial cell. First abscissa of mediocubital vein of hind wing 1.2-1.4 times as long as second abscissa. Hind femur 3.3-3.6 times as long as wide. Metasoma 1.1-1.2 times as long as head and mesosoma combined.
Etymology. After Latin "robustus", meaning "strong", because of the first metasomal tergite short and wide.
Description. Female. Body length 6.0-7.2 mm; fore wing length 4.8-5.4 mm. Head width 1.2-1.3 times as long as its median length, about 1.1 times as long as width of mesoscutum. Frons without carina, with shallow or very shallow median furrow. Head behind eyes (dorsal view) weakly convex anteriorly, roundly narrowed posteriorly; transverse diameter of eye almost equal to temple. Ocellar triangle situated before middle of head (dorsal view), its anterior ocellus situated almost on middle level of eyes. Ocelli medium-sized, in triangle with base 1.2-1.3 times as long as its sides. POL 1.0-1.3 times Od, 0.4-0.5 times OOL. Eye rather densely and shortly setose, with very shallow or indistinct emargination opposite antennal sockets, 1.3-1.4 times as high as broad. Face along eyes without distinct carinae, with short and shallow elongate depressions above clypeus; width of face 1.15-1.20 times as long as height of eye and 1.3-1.4 times as long as height of face and clypeus combined. Diameter of antennal socket 1.1-1.4 times as long as distance between sockets and 1.4-1.6 times as long as distance between socket and eye. Malar suture indistinct. Malar space 0.40-0.45 times as long as height of eye, almost equal to basal width of mandible. Clypeus with wide flange ventrally. Clypeal suture complete, deep laterally and very shallow dorsally. Hypoclypeal depression round, its width 1.1-1.2 times as long as distance from edge of depression to eye, 0.45-0.50 times as long as width of face. Occipital carina ventrally fused with hypostomal carina at upper base of mandible. Maxillary palpi long, 1.1-1.2 times as long as head height.
Antennae rather thick, weakly setiform, 36-37-segmented, 0.75-0.80 times as long as body. Scape 1.7-1.9 times as long as its maximum width. First flagellar segment 2.7-3.0 times as long as its apical width, 1.15-1.30 times as long as second segment. Penultimate segment 1.7-1.9 times as long as wide, about 0.4 times as long as first flagellar segment, 0.7-0.8 times as long as apical segment; the apical segment distinctly pointed apically.
Mesosoma. Length about twice as long as its height. Pronotum weakly convex dorsally (lateral view), with fine pronotal carina in anterior 0.4. Median lobe of mesoscutum (dorsal view) rather distinctly protruding forward, with shallow and wide median furrow. Notauli deep anteriorly and shallow posteriorly, wide, densely coarsely crenulate-rugulose with granulation partly. Prescutellar depression rather deep, long, with one to three carinae, rather coarsely rugose entirely, about 0.5 times as long as scutellum. Scutellum weakly convex, without lateral carinae. Metanotum (dorsal view) with two strongly and curvedly convergent and fused posteriorly with large rugulose area lateral carinae, without median carinae; with short and obtuse metanotal tooth. Subalar depression shallow, wide, coarsely striate-rugose. Sternaulus deep, weakly curved or straight, oblique, densely and coarsely crenulate and with fine or very fine granulation, connected with prepectal carina anteriorly, running along anterior 0.6-0.7 of lower part of mesopleuron. Metapleural flange rather short, wide, rounded apically. Propodeum with rather distinct, short, thick lateral tubercles.
Wings. Fore wing 3.5-3.6 times as long as its maximum width. Radial vein arising behind middle of pterostigma, inner basal part of pterostigma 1.2-1.3 times as long as its inner apical part. Radial cell not shortened; metacarp 1.3 times as long as pterostigma. First radial abscissa 0.6-0.8 times as long as maximum width of pterostigma. Se cond radial abscissa 3.6-4.0 times as long as first abscissa, 0.6 times as long as the straight third abscissa, 1.3-1.5 times as long as first radiomedial vein. Second radiomedial cell 2.3-2.5 times as long as its maximum width, 1.1 times as long as brachial cell. First medial abscissa almost straight or weakly sinuate. Mediocubital vein weakly curved. Recurrent vein 3.0-3.3 times second abscissa of medial vein. Distance from nervulus to basal vein 0.7-1.0 times as long as nervulus. Parallel vein arising from posterior 0.25 of distal margin of brachial cell. Hind wing 4.7-5.2 times as long as its maximum width. First costal abscissa 0.6-0.7 times as long as second abscissa. First abscissa of mediocubital vein 1.5-1.8 times as long as second abscissa. Radial cell weakly narrowed posteriorly. Mediocubital cell large, widened toward apex, 6.5-6.7 times as long as wide, 0.45-0.50 times as long as whole length of wing. Recurrent vein straight or weakly curved, oblique, more or less distinctly postfurcal, unsclerotized but distinctly pigmented.
Legs. Fore tibia with numerous slender spines arranged in rather narrow stripe. Hind coxa without dorsal tooth, 1.3-1.5 times as long as wide (with tubercle). Hind femur 3.5-3.6 times as long as wide. Hind tarsus 0.85-0.90 times as long as hind tibia. Hind basitarsus 0.80-0.85 times as long as second-fifth segments combined. Second segment of hind tarsus 0.40-0.45 times as long as basitarsus, 1.20-1.25 times as long as fifth segment (without pretarsus).
Metasoma 1.1-1.2 times as long as head and mesosoma combined. First tergite with large dorsope, with small spiracular tubercles in basal 0.3, rather weakly and almost linearly widened from base to apex. Maximum width of first tergite 1.7 times its minimum width; length 0.9-1.1 times as long as its apical width. Second tergite without basomedian area, 0.5-0.6 times as long as its basal width, 0.85-0.90 times as long as third tergite. Second suture straight, shallow, complete. Third tergite without transverse furrow. Ovipositor sheath 0.8-1.1 times as long as body, 1.5-2.2 times as long as metasoma, 2.4-3.3 times as long as mesosoma, 1.1-1.4 times as long as fore wing.
Sculpture and pubescence. Vertex entirely or mostly more or less coarsely or (rarely) rather finely curvedly striate; frons entirely coarsely and partly undulately rugosestriate, with granulation between striae; face distinctly and rather densely transverse striate-rugose with dense and fine granulation, clypeus smooth with rugulosity below; temple rather coarsely or rather finely vertically striate, smooth on more or less narrow part near eye. Sides of pronotum entirely coarsely rugose, with crenulate median furrow. Mesoscutum densely and rather finely punctulate-rugulose entirely, with dense and rather fine granulation between rugae, coarsely rugose in wide area on medioposterior half. Scutellum mostly smooth. Mesopleuron rather coarsely or sometimes finely rugose, with two-three small smooth areas. Propodeum with rather distinctly delineated by carinae areas, entirely coarsely rugose-reticulate; basolateral areas large, entirely coarsely rugose-reticulate with dense granulation at least in anterior half; areola long and narrow, 1.6-1.8 times as long as wide; dorsal carina long, 1.1-1.7 times as long as areola fork. Hind coxae almost entirely and densely rugose-reticulate with dense and fine granulation between rugae. Hind femur rugulose-areolate with dense fine granulation dorsally and laterally, almost smooth ventrally. First tergite densely, coarsely linearly or curvedly striate, rugose-reticulate in mediobasal 0.3-0.7, without distinct ground sculpture between striae. Second tergite sparsely striate in basal 0.2-0.3, sometimes (holotype) with three semicircular striae or with curved striae basomedially, smooth on remaining part. Remaining tergites smooth. Vertex with rather sparse, short and semi-erect setae; mesoscutum entirely with very dense, short and semi-erect pale setae. Hind tibia dorsally with short, dense and almost erect or semi-erect setae, length of these setae about 0.5 times as long as maximum width of hind tibia.
Colour. Body black, metasoma behind first tergite dark reddish brown, yellowish brown or reddish brown ventrally, sometimes metasoma light reddish brown medially. Antennae dark reddish brown to black. Palpi reddish brown or sometimes dark reddish brown. Legs reddish brown, partly yellowish, all tibiae basally yellow. Ovipositor sheath black. Fore wing membrane rather distinctly infuscate. Pterostigma brown, sometimes very shortly paler basally and apically.
Male unknown. Distribution. China (North East); Korea. Diagnosis. This new species is very similar to O. imperator (Haliday), but differs in having the vertex almost entirely or mostly and temple at most part distinctly striate, and the mesoscutum almost entirely, very densely and finely granulate with sparse punctation. It is also similar to O. rugivertex sp. n., but differs in having the antennae rather distinctly shorter than body, the first abscissa of mediocubital vein of hind wing longer, the hind femur wider, the second segment of hind tarsus shorter, the first tergite shorter and wider, the second tergite shorter, and the palpi dark.
Description. Female. Body length 5.5-7.0 mm; fore wing length 5.0-6.2 mm. Head width 1.2-1.3 times as long as its median length, 1.1 times as long as width of mesoscutum. Frons without carina, with shallow or very shallow median furrow. Head behind eyes (dorsal view) weakly convex anteriorly, roundly narrowed posteriorly; transverse diameter of eye 1.0-1.1 times as long as temple. Ocellar triangle situated distinctly behind middle of head (dorsal view), its anterior ocellus situated behind middle level of eyes. Ocelli medium-sized, in triangle with base 1.2-1.3 times as long as its sides. POL 1.0-1.2 times Od, 0.35-0.40 times OOL. Eye rather densely and shortly setose, with shallow or very shallow emargination opposite antennal sockets, 1.3 times as high as broad. Face along eyes without distinct carinae, with distinct small shallow elongate depressions above clypeus; width of face 1.2 times as long as height of eye and 1.20-1.25 times as long as height of face and clypeus combined. Diameter of antennal socket 1.0-1.3 times as long as distance between sockets and 1.5-1.7 times as long as distance between socket and eye. Malar suture indistinct. Malar space 0.45-0.50 times as long as height of eye and 0.8-0.9 times as long as basal width of mandible. Clypeus with wide flange ventrally. Clypeal suture distinct and complete. Hypoclypeal depression round, its width almost equal to distance from edge of depression to eye, 0.45 times as long as width of face. Occipital carina ventrall fused with hypostomal carina at upper base of mandible. Maxillary palpi long, 1.3-1.4 times as long as head height.
Antennae rather thick, almost filiform, 37-43-segmented, almost as long as body. Scape 1.8-2.0 times as long as its maximum width. First flagellar segment 3.6-3.8 times as long as its apical width, 1.2-1.3 times as long as second segment. Penultimate segment 2.0-2.2 times as long as wide, 0.4 times as long as first flagellar segment, 0.7 times as long as apical segment; the apical segment distinctly pointed apically.
Wings. Fore wing 3.4 times as long as its maximum width. Radial vein arising weakly behind or from middle of pterostigma. Radial cell not shortened; metacarp 1.3-1.4 times as long as pterostigma. First radial abscissa 0.6-0.7 times as long as maximum width of pterostigma. Second radial abscissa 3.5-3.7 times as long as first abscissa, 0.5-0.6 times as long as the straight third abscissa, 1.3-1.5 times as long as first radiomedial vein. Second radiomedial cell 2.2 times as long as maximum width, 1.1-1.2 times as long as brachial cell. First medial abscissa almost straight. Mediocubital vein not curved. Recurrent vein 2.5-3.0 times as long as second abscissa of medial vein. Distance from nervulus to basal vein 0.4-1.0 times as long as nervulus. Parallel Male unknown. Distribution. China (Henan, Shaanxi). Diagnosis. The new species is similar to O. ignea Ratzeburg, but differs in having the vertex coarsely rugose-striate entirely or almost entirely, the first flagellar segment shorter, the second tarsal segment of hind leg distinctly longer than fifth segment (without pretarsus), and the mesoscutum coarsely rugose-granulate. It resembles O. robusta sp. n., but their differences are listed after the description of O. robusta.