Orthocentrus pulchellus 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

18. Orthocentrus pulchellus Humala & Lee sp. nov.

Fig. 13

Description.

Female. Fore wing length 3.1 mm.

Face at level of antennal sockets 1.4 times as wide as high; face smooth, polished, sparsely punctate, eyes not setose, dorsal ridge of face in between antennal sockets with a median blunt low prominence; face profile straight except dorsally very slightly impressed, inner orbits slightly divergent ventrally; edge of clypeus straight, antennal sockets not on a distinct high shelf; subocular sulcus narrow, nearly straight; maxillary palp reaching beyond fore coxa. In dorsal view, head posteriorly concave, temples very short, lateral ocellus separated from eye by a distance of 1.8 times longer than its maximum diameter, POL 1.5 times as long as diameter of lateral ocellus; ocellar-ocular grooves present. Minimum distance between antennal sockets about half of the diameter of socket; antenna moderately long, with 30-31 flagellomeres elongate (n = 4); flagellum considerably thinned apically; first flagellomere about 3.5 times as long as wide and about 0.8 times as long as scape; scape slightly convex on inner surface, slightly concave on outer surface.

Mesosoma smooth and polished; mesoscutum anteriorly with distinct notauli; in profile, scutellum high, metapleuron slightly convex; propodeum with posterior transverse carina complete, strong and raised between lateral longitudinal carinae, lateromedian longitudinal carinae complete, lateral longitudinal carinae distinct, spiracle small.

Legs robust; coxae polished, femora with coriaceous microsculpture, tibiae and tarsi coriaceous-granulate; hind femur 2.9 times as long as high, hind tibia 3.7 times as long as apically wide; tibiae with spine-like setae.

Wings not particularly narrow; fore wing without areolet, vein 2rs-m about 0.6 times as long as portion of 1m-cu between 2rs-m and 2m-cu; pterostigma comparatively wide, vein Rs bent upwards, fore wing with vein Rs+2r meeting apical 0.6 of pterostigma; vein cu-a strongly oblique, distad of Rs&M; nervellus intercepted below.

First tergite 1.8 times as long as posteriorly wide; coriaceous, with two lateromedian longitudinal carinae and longitudinal striae, with transverse impressions originating at about middle of tergite, sloping posteriorly, meeting centrally.

Second tergite 1.6 times as long as posteriorly wide; coriaceous and longitudinally striate, with developed lateromedian longitudinal carinae, anterior corners impressed and transverse groove near posterior margin bending anteriorly near lateral margins, forming a somewhat uplifted area medially; oval thyridia contrastingly coloured. Third tergite longitudinally striate anteriorly, remainder of metasoma unsculptured, polished. Ovipositor thin, comparatively short, weakly upcurved, without subapical dorsal notch; sheaths short, concealed by hypopygium.

Body setose except eyes, pronotum, mesopleuron and metapleuron, setae scattered on metasoma and posterior sides of coxae.

Brown; face, frons and vertex yellowish, inner orbits broadly creamy-yellow up to occiput, interocellar area fuscous; antenna yellowish-brown; malar area yellow posterior to subocular sulcus and up to level of half of eye; mouthparts, fore and mid legs, hind coxa, trochanters and tarsi and longitudinal bars along notauli yellow; propleuron, lower and upper pronotum, medial part of mesoscutum anteriorly, scutellum, mesopleuron in lower half, hind coxa and trochanters and tarsi reddish brown; posterior margin of tergite 1and anterior corners and posterior margin of tergite 2 yellowish-brown; sometimes hind femur except basal 0.2 and hind tibia except light basal ring brown.

Male. Unknown.

Biology.

Hosts unknown.

Etymology.

Named from the Latin Orthocentrus pulchellus (nice, pretty) after its rich body colouration.

Comparison.

This is a distinctive species on account of the entirely yellow face and frons (except for the interocellar area), the absence of the fore wing areolet and the presence of yellow bars along the notauli on the median part of the mesoscutum.

Material examined.

Holotype: female; South Korea, GB: Namsa-ri , Hyeongok-myeon, Kyeongju-si, MT II, 15-29.IX.2005, J.T. Mun leg. (DNUE).

Paratypes: South Korea, CN: 1♀, Daejeon, Donggu, Daehang-no 65, Daejeon University , MT, 15.VIII-30.IX.2006, J.W. Lee leg. (DNUE-0260); GG: 2♀, Seoul, Cheongyangri-dong, Dongdaemun-gu, MT III, S.N.U. 12-20.IX.2005, W.I. Choi leg. (DNUE-0908,0910) .

Distribution.

South Korea (CN, GB, GG).

Figures

Figure 13. Orthocentrus pulchellus 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 wings G first to third tergites in dorsal view.