Stephanus bidentatus van Achterberg, 2002

Binoy, C., Achterberg, C. Van, Kumar, P. Girish, Santhosh, S. & Sheela, S., 2020, A review of Stephanidae (Hymenoptera: Stephanoidea) from India, with the description of five new species, Zootaxa 4838 (1), pp. 1-51 : 44-47

Stephanus bidentatus van Achterberg, 2002

( Figs 95–105 )

Stephanus bidentatus van Achterberg, 2002 , Zool. Meded. Leiden, 78 (3), 104.

Type material. Holotype ♀, China: Henan, Longyuwan, Lianchuan, (29°55’46.1”N & 118°29’35.5”E, 700 m), on trunk of Quercus tree with Cerambycidae larvae, 13.vii.1996, Coll. Zhong-qi Yang, ( CAFB).

Material Examined: 1 ♂, mounted on triangular card, India: Andaman and Nicobar , Nicobar Islands , Great Nicobar, Chingen Basti (6°49’14.1”N & 93°53’05.1”E, 76 m), 08.xi.2010, Coll. E. E. Jehamalar, ( ZSIK) Regd. No. ZSI/ WGRC /IR/INV.13599 .

Description. ♂ (hitherto unknown). Body length 14.1 mm. Fore wing length 7.5 mm.

Colour. Reddish brown with the following parts different: face reddish orange; eyes golden to yellowish orange; mandibles apically black; ocelli reflective golden yellow; antennae with scape and pedicel reddish orange; rest of the antennomeres brown or reddish brown; fore wing membrane mainly with brownish infumation; pterostigma dark brown; hind trochantellus apically, and fore and middle legs reddish brown; tarsi and palpi brown.

Head. Third antennal segment moderately slender, 2.3× as long as wide, and 0.8× as long as fourth segment (antenna broken after 10 antennomeres); three anterior coronal teeth of head large, hardly larger than posterior ones ( Fig. 97 & 98 ); with four curved carinae behind level of both posterior coronal lobes, fourth one shallow; remaining part of vertex medio- dorsally with finely curved rugae, becoming finer posteriorly and narrowly reaching occipital carina ( Fig. 99 ); temples smooth and with sparse setae ventrally ( Fig. 97 ); dorsally occipital carina distinct, carina ventrally weaker than laterally and reaching hypostomal carina; postgenal bridge steep.

Mesosoma . Neck robust and rather short, anteriorly distinctly concave, lateral length of neck 0.83× its maximum width, neck postero-dorsally lower than medial part of pronotum, and with five coarse carinae laterally, posterior two presented medio-anteriorly, large cavity in middle part of pronotum and pronotal fold absent medially; middle part of pronotum robust, coarsely rugose, without median carina, with some irregular and rather strong transverse rugae, middle part not differentiated from posterior part of pronotum, without steps between parts; pronotum setose dorso-laterally with dorso-median bare area; distinctly rugose; mesoscutum densely punctate with a distinct median groove formed of deep pits; scutellum smooth medially, scattered pits laterally; axillae smooth with few deep pits, separated from scutellum by a deep large fovea ( Fig. 100 ); propleuron faintly convex, rugose and highly setose; mesopleuron punctate with rugose interspaces and densely setose, convex part rugose-reticulate with lesser setosity near the mesopleura-metapleura junction; metapleura shiny, with large rugae ( Fig. 101 ); propodeum completely and coarsely punctate with pits and interspaces smooth and shiny; fore wing: vein 1-M almost straight, 4.4× as long as vein 1-SR; wing basally and area below pv and pterostigma largely glabrous; vein M+CU of hind wing only partly pigmented, after middle of wing ( Fig. 102 ); hind coxa slender, largely rugose and shiny, anteriorly and ventrally less sculptured, densely setose with long dirty white setae; hind femur with two large teeth, 3–4 denticles in between and few denticles apically, femur 3.2× as long as its maximum width, basal half smooth, rest with micro pitted, with long dirty white setae arising from scattered pits; setosity concentrated more on ventral margin; basal narrow part of hind tibia parallel-sided and 0.55× as long as widened part, and with ventral carina, outer side of widened part of hind tibia coriaceous, convex, antero-dorsally with weak tubercle, ventrally with distinct oblique striae and no median carina, and rather narrowed apically, inner side flattened and widened part largely with densely bristly setosity, no distinct punctures, and with indistinct depression below tubercle ( Fig. 103 ); hind basitarsus parallel-sided, basally hardly curved, its ventral length 5× its width.

Metasoma. First tergite slender, 13.5× as long as its apical width width, and largely irregularly and coarsely transversely rugose on basal third, remainder finely and more densely rugose, parallel-sided ( Fig. 104 ); second tergite mainly smooth basally, remainder part and rest of tergites microsculptured with sparse setosity latero-ventrally ( Fig. 105 ).

Host. Probably a parasitoid of Cerambycidae larvae in Quercus species and other deciduous trees ( van Achterberg &Yang 2004); unknown in the present study.

Distribution. Palaearctic ( China) ( van Achterberg & Yang 2004; Hong et al. 2011), Oriental ( India (present report)).

Figures

FIGURE 95. Habitus of ♂ Stephanus bidentatus van Achterberg & Yang, 2004.

FIGURES 96–103. Stephanus bidentatus van Achterberg & Yang, 2004 ♂. 96. Habitus, lateral view (excluding metasoma in part); 97. Head, lateral view; 98. Head, frontal view; 99. Head, dorsal view; 100. Mesosoma, dorsal view; 101. Mesosoma, lateral view; 102. Fore wing; 103. Hind leg.

FIGURES 104–105. Stephanus bidentatus van Achterberg & Yang, 2004 ♂. 104. First metasomal tergite; 105. Metasoma (ex- cept first tergite), lateral view.