Orthocentrus leucostomus Humala & Lee, 2020

Humala, Andrei E., Lee, Jong-Wook & Choi, Jin-Kyung, 2020, A review of the genus Orthocentrus Gravenhorst (Hymenoptera, Ichneumonidae, Orthocentrinae) from South Korea, Journal of Hymenoptera Research 75, pp. 15-65 : 15

11. Orthocentrus leucostomus Humala & Lee sp. nov.

Fig. 9

Description.

Female. Fore wing length 2.7 mm.

Face at level of antennal sockets as wide as high; head smooth and polished, face granulate, eyes not setose, dorsal ridge of face in between antennal sockets without a median prominence; face profile straight except just before antennal sockets impressed, edge of clypeus straight, antennal sockets on a shelf; malar space with narrow, almost straight subocular sulcus; maxillary palp reaching to beyond fore coxa. In dorsal view, head posteriorly concave, temples short, lateral ocellus distant from eye by a distance 1.1 times longer than its maximum diameter, POL 1.1 times as long as diameter of lateral ocellus, lacking ocellar-ocular grooves. Minimum distance between antennal sockets about 0.4 × diameter of socket; antenna comparatively short and thick, with 22 flagellomeres (n = 3) which gradually shorten apically; first flagellomere about 2.0 times as long as wide and about 0.6 times as long as scape; scape nearly parallel-sided.

Mesosoma smooth and polished except postero-ventral corner of pronotum with short striae, mesoscutum with indicated notauli; in profile, scutellum weakly convex, metapleuron convex; propodeum with coriaceous microsculpture and with complete posterior transverse carina, lateromedian longitudinal and lateral longitudinal carinae; spiracle small.

Legs slightly flattened, broad; coxae and femora polished, tibiae and tarsi coriaceous-granulate; hind femur 3.1 times as long as high, hind tibia 3.6 times as long as apically wide; tibiae dorsally with spine-like setae; spurs curved apically.

Wings not particularly narrow, fore wing with narrowly sessile areolet, vein 3rs-m weak, areolet not longer than high, 2rs-m shorter than 3rs-m, 2m-cu meeting areolet at apical 0.6-0.7, nervellus intercepted below middle.

First tergite 1.8 times as long as posteriorly wide, in dorsal view, slightly wider at spiracles; coriaceous, with lateromedian longitudinal carinae, with weak transverse impressions originating at about middle of tergite, sloping posteriorly, not meeting centrally. Second tergite 1.3 times as long as posteriorly wide; coriaceous with dense striae, polished posteriorly, transverse impressions originating at about middle of tergite, sloping anteriorly and posteriorly, not meeting clearly centrally; anterior thyridia rounded, contrastingly coloured. Remaining tergites smooth and polished; third tergite with coriaceous microsculpture antero-medially. Ovipositor straight, thin, comparatively long, without dorsal notch; ovipositor sheath narrow, pointed, with setae longer than sheath width and slightly curved backwards.

Body setose except eyes, pronotum, mesopleuron, metapleuron; setae on propodeum, basal tergites and posterior sides of coxae very few.

Blackish brown except mouthparts and malar space creamy, sternites creamy, fore and mid coxa and all trochanters and trochantelli largely yellow, antenna dull yellow ventrally, infuscate over entire dorsal side. Hind coxae fuscous in basal 2/3, hind femur brownish, except for basal third. Clypeus apically and sometimes dorsal ridge of upper face between antennae narrowly yellowish, frontal orbits yellow to vertex. One paratype from Cheongdo-gun has a lighter face and hind legs.

Male. Unknown.

Biology.

Hosts unknown.

Etymology.

Named from the Greek λευκο (white) and στομα (mouth) after the creamy mouthparts.

Comparison.

Compared with the other species that have antennal sockets on a shelf, the face is granulate, the inner orbits yellowish up to the level of the lateral ocelli, antenna comparatively short and thick, with 22 flagellomeres, malar space and mouthparts creamy, notauli well developed.

Material examined.

Holotype: female; South Korea, GG: Pocheon-si , Soheur-eup , Jikdong-ri , 51-7, Korean National Arboretum, Saengtae tower, 37°44'56"N, 127°08'54.5"E, 17-30.V.2013, I.G. Kim leg. (DNUE).

Paratypes: South Korea, 1♀, GB: Daegu-si , Dong-gu, Palgongsan-ro, 237 gil (site 39), 35°59'19.55"N, 128°42'55.55"E, MT, 12.VI-14.VII.2014, J.W. Lee leg. (DNUE); GB : 1♀, Cheongdo-gun , Unmun-myeon, Mt. Unmun 35°38'32"N, 128°57'50"E, 2-16.VIII.2013, J.W. Lee leg. (DNUE) .

Distribution.

South Korea (GG, GB).

Figures

Figure 9. Orthocentrus leucostomus sp. nov. Holotype. A Habitus in lateral view B head in frontal view C head in dorsal view D head and mesosoma in lateral view E mesosoma in dorsal view F areolet G propodeum and first to second tergites in dorsal view.