Orientopius Fischer (Hymenoptera, Braconidae, Opiinae) new for continental China, with description of a new species

The genus Orientopius Fischer, 1966 (Hymenoptera: Braconidae: Opiinae) is reported for the first time from continental China and a new species (O. punctatus sp. n.) is described from Hunan. Orientiopius tambourinus Fischer, 1966, is transferred back to the genus Orientopius. A key to the Indo-Australian spe-


introduction
The genus Orientopius Fischer, 1966 (Braconidae: Opiinae) is a small genus with 15 described species from Palaearctic, Oriental and Australian regions.Orientopius is closely related to Coleopius Fischer, 1964 (Wharton 1988; van Achterberg et al. 2012); they could be treated as subgenera within the same genus, but the decision is postponed till more is known about the phylogeny of this group.Both have the female metasomal carapace covering the fourth and following tergites or largely so, the second metasomal tergite distinctly (1.3-2.1 times) longer than the third tergite, the third tergite with a sharp lateral crease and the second submarginal cell of the fore wing short (vein 3-SR up to 1.3 times as long as vein 2-SR).Orientopius can be separated from Coleopius as follows: malar suture complete and distinctly impressed (incomplete and obsolescent in Coleopius); medio-posterior depression of mesoscutum present (absent) and second metasomal suture distinctly crenulate, except in Australian species (finely sculptured, without distinct crenulae).Wharton (1988) included the Australian O. tambourinus Fischer, 1966, in Coleopius, because of similarities of the metasomal carapace.According to the differences listed above it agrees better with Orientopius and is, therefore, transferred back to Orientopius.
Its biology was unknown until recently van Achterberg et al. (2012) reported a new species of Orientopius from two species of the genus Phytobia Lioy, 1864 (Agromyzidae) mining near the cambium of trees and shrubs of Crataegus monogyna Linnaeus and Prunus spinosa Linnaeus in northern France.In general, Opiinae are solitary koinobiont endoparasitoids of larvae of cyclorrhaphous Diptera and may play an important role in the control ofdipterous pests such as fruit-infesting Tephritidae and mining Agromyzidae.Oviposition may take place in the egg of the host (ovo-larval parasitoids); the metasomal carapace of Orientopius spp.indicates that the oviposition is in a hard substrate.The parasitoid larva has its final development when the host larva has made its puparium and the adult parasitoid emerges from the host puparium.For the first time a key to the non-Palaearctic species of the genus Orientopius is supplied; a key to the Palaearctic species is given by van Achterberg et al. (2012).
Notes.Fischer (1966Fischer ( , 1972Fischer ( , 1987) ) lists as a character of the genus that (translated) the second and third tergites are united and have no transverse furrow (= second metasomal suture).This is a misinterpretation of the carapace of the male holotype (Figs 23,24); the holotype has a long second tergite, a distinctly crenulate second metasomal suture and a comparatively short third tergite.The fourth tergite is rather exposed and smooth, what is typical for males; females have the fourth tergite largely retracted (Figs 5,10).Diagnosis.Vein SR1 ends near apex of fore wing (Fig. 13); vertex moderately densely punctate, with interspaces mostly wider than diameter of punctures or wider (Fig. 4); antenna dark brown, except basally; malar space about 1.5 times as long as basal width of mandible and head less elongate in anterior view (Fig. 8); pterostigma dark brown; mesosoma dark brown or blackish (Figs 1,3,4); transverse carina of pro-podeum distinctly in front of middle of propodeum; hind basitarsus about 3.7 times as long as wide (Fig. 11); dorsal carina of first tergite united subbasally; second tergite about twice as long as third tergite and with rows of punctures between striae (Fig. 5); third tergite 0.3 times longer than its basal width; third metasomal tergite semi-circular and partly distinctly punctate (Fig. 5); fourth tergite of female smooth and retracted (Fig. 1); setose part of ovipositor sheath 0.6 times as long as combined first-third metasomal tergites, 0.2 times as long as fore wing and 0.8 times as long as hind tibia (Fig. 1).

Orientopius punctatus van
Description.Holotype, ♀, length of body 2.3 mm, of fore wing 2.5 mm.Head.Antenna with 25 segments and 1.1 times as long as fore wing; third segment 1.1 times as long as fourth segment, length of third, fourth and penultimate segments 2.7, 2.5 and 1.8 times their width, respectively (Figs 7,12); length of maxillary palp unknown, palp submerged in glue; occipital carina widely removed from hypostomal carina and dorsally absent; hypostomal carina narrow; length of eye in dorsal view 3.3 times temple; temples directly narrowed (Fig. 4) and largely smooth; vertex finely punctate, with interspaces mostly wider than punctures; frons slightly depressed behind antennal sockets and with some curved rugulae, remainder slightly convex and setose, largely finely punctate, with interspaces wider than punctures; face medio-dorsally elevated, coarsely punctate, with interspaces slightly wider than punctures and some striae latero-dorsally; width of clypeus 2.8 times its maximum height and 0.6 times width of face; clypeus flat, smooth and its ventral margin rather thin and medially straight; hypoclypeal depression wide and deep (Fig. 8); labrum flat (including ventral rim); malar suture complete; with punctures between malar suture and clypeus; length of malar space 1.5 times basal width of mandible (Fig. 9); mandible strongly constricted and twisted apically, without distinct ventral carina, second tooth medium-sized.Mesosoma.Length of mesosoma 1.3 times its height; dorsal pronope absent, pronotum short and nearly vertical anteriorly; pronotal sides smooth but oblique groove anteriorly and posterior groove coarsely crenulate (Fig. 3); epicnemial area with few crenulae dorsally; precoxal sulcus distinctly impressed, but posterior 0.4 absent, and coarsely crenulate (Fig. 3); pleural sulcus distinctly crenulate; mesosternal sulcus and postpectal carina not visible because of glue; metapleuron coarsely reticulate ventrally and dorsally largely smooth (except some punctures); notauli impressed and with few crenulae anteriorly, and largely absent on disk; mesoscutum flattened, with large elliptical medio-posterior depression, setose and punctulate; scutellar sulcus wide and with 3 coarse crenulae (Fig. 4); scutellum rather flat and sparsely punctulate; metanotum with weak median carina; propodeum posteriorly largely smooth, with coarse curved transverse carina in front of middle and anteriorly rugose and with rather short median carina (Fig. 5).
Legs.Length of femur, tibia and basitarsus of hind leg 3.8, 7.0 and 3.7 times as long as wide, respectively (Fig. 11); hind femur with long setae and tibia densely rather short setose; third and fourth segments of fore tarsus distinctly longer than wide and about as long as wide, respectively.
Metasoma.Length of first tergite 0.8 times its apical width, its surface smooth in front of united dorsal carinae and coarsely punctate-reticulate behind carinae, convex and no median carina posteriorly (Fig. 5); second suture coarsely crenulate, nearly straight, slightly widened medially and distinctly impressed; second tergite with row of punctures between longitudinal striae; median length of second tergite 2.1 times median length of third tergite; third tergite mainly with rows of punctures, but medially and posteriorly smooth; following tergites smooth and largely retracted below carapace; length of setose part of ovipositor sheath 0.22 times fore wing, 0.6 times first-third tergites combined and 0.8 times longer than hind tibia; hypopygium far retracted, truncate apically and about 0.2 times as long as metasomal carapace.