First record of Eubroncus (Hymenoptera, Mymaridae) from China, with description of three new species

Abstract The genus Eubroncus Yoshimoto, Kozlov & Trjapitzin is first recorded from China, and three species, E. hani sp. n., E. tibetanus sp. n. and E. vertexus sp. n. are described as new. A key to the six described species is given, with photomicrographs to illustrate morphological characters.


Introduction
established the new subfamily Eubroncinae, including two genera, Eubroncus and Stomarotrum, based on prominent mandibles that were almost as long as the head height. Eubroncus was erected for the type species E. orientalis Yoshimoto, Kozlov & Trjapitzin (male) from Malaysia, and Stomarotrum was erected for the type species S. prodigiosum Yoshimoto, Kozlov & Trjapitzin (female) from the Russian Far East. Triapitsyn and Huber (2000) synonymized Stomarotrum with Eubroncus. Triapitsyn and Berezovskiy (2002) redescribed E. prodigiosus (Yoshimoto, Kozlov & Trjapitzin) and keyed males of the two known species based on color of mesosoma and whether the pronotum is divided or not. Viggiani (2003) described the male genitalial structure of E. prodigiosus from Japan. Lin et al. (2007) recorded an unidentified species from Australia. Hayat and Khan (2009) described the third species, E. indicus Hayat & Khan, from a single female from India. Here we report the genus from China and describe three new species.

Materials and methods
Specimens were collected from Xizang Province (Tibet) and Yunnan Province (Southwest China) using yellow pan traps.
Specimens were dissected and mounted dorsally or laterally in Canada balsam on slides following the method described by Noyes (1982) and modified for the Mymaridae by Huber (1988).
Photographs were taken with a digital CCD camera attached to an Olympus BX51 compound microscope, and most measurements were made from slide-mounted specimens using an eye-piece reticle. Total body length excluding ovipositor was measured mostly with an eye-piece reticle from alcohol-preserved specimens before being dissected, but sometimes from slide-mounted specimens (meso-and metasoma, without head). All measurements are given in micrometers (μm).
Morphological terminology and abbreviations are those of Gibson (1997) and Huber (2012), as follows (with some additions): Vertex with conspicuous scale-like sculpture in anterior half, smooth in posterior half or nearly so (Fig. 10); propodeum with distinct reticulate sculpture medially (Fig. 13); scutellum with transverse row of fovea extending to lateral margins (Fig. 13)  Paratypes. With same data as holotype (3♀♀, NEFU). Diagnosis. Vertex with light reticulation; pronotum with a faint longitudinal carina medially; scutellum with short transverse row of fovea medially; hind wing with a group of notably long setae on disc behind the distal part of marginal vein; petiole with relatively long spine-like projections anterolaterally.

YPT
Description. Female. Body length 1.08-1.15 mm. Head black with ocelli and mandibles brown and eyes pinkish. Antenna dark brown with apical part of radicle brown and scape yellowish-brown. Mesosoma blackish with pronotum dark brown. Wings infuscate with base of forewing dark brown, largely less infuscate behind the marginal vein and apical part of submarginal vein. Legs brown except protibial spur, trochanters, basal three tarsal segments light brown. Metasoma brown with ovipositor light brown. Head ( Fig. 1) 1.11-1.15× as long as wide. Eye subtriangular, with relatively long setae, each seta longer than the diameter of a facet. Vertex 1.1-1.3× as long as wide, with light reticulate sculpture. Ocelli in an obtuse triangle; mid ocellus oval, MOL 1.2-1.8× as long as OD; post ocellus oval, OCL approximately as long as POD; POL about 4.7-5.1× as long as OOL. Mandibles (Fig. 2) 0.68-0.78× as long as head and 1.0-1.1× as long as vertex in dorsal view. Antenna (Fig. 3) with radicle 0.2-0.4× as long as scape; scape with light reticulate sculpture, 4.0-5.4× as long as wide; pedicel 1.6-2.0× as long as wide, 2.5-2.8× as long as fl 1 ; fl 2 -fl 6 each with 2 mps; clava a little shorter than scape, 2.2-2.5× as long as wide, with 6-8 mps.
Measurements ( Diagnosis. Vertex with distinct scale-like sculpture in anterior half, smooth or almost smooth in posterior half; pronotum with a faint longitudinal carina medially; hind wing with a group of notably long setae on disc behind the distal part of marginal vein; petiole with relatively long spine-like projections anterolaterally. Description. Female. Body length 1.00-1.32 mm. Head black with ocelli and mandibles brown and eyes pinkish. Antenna dark brown with radicle yellowish-brown. Mesosoma black. Wings infuscate with base of forewing dark brown. Legs brown except protibial spur, trochanters, basal three tarsal segments light brown. Metasoma brown with apex fading to brown to yellow brown. Head (Fig. 10) 1.1-1.2× as long as wide. Eye subtriangular, with relatively long setae, each seta distinctly longer than the diameter of a facet. Vertex 1.10-1.25× as long as wide, its posterior margin 1.6-2.0× as long as anterior margin, with conspicuous scale-like sculpture in anterior half, almost smooth in posterior half. Ocelli in an obtuse triangle; mid ocellus round, MOL approximately twice as long as OD; post ocellus oval, OCL about as long as POD; POL about 3.8-4.0× as long as OOL. Mandibles (Fig. 11) 0.7× as long as head and 1.0-1.1× as long as vertex in dorsal view. Antenna (Fig. 12) with radicle 0.25-0.30× as long as scape; scape 3.8-4.7× as long as wide; pedicel 1.6-1.8× as long as wide, 2.5-3.0× as long as fl 1 ; fl 2 -fl 6 each with 2 mps; clava slightly shorter than scape, 2.00-2.35× as long as wide, with 7 mps. Mesosoma (Fig. 13) in dorsal view 1.6-1.8× as long as wide. Pronotum 0.6-0.8× as long as wide, with a faint longitudinal carina medially, each lobe with about 29-33 setae dorsally. Mesoscutum 0.7-0.8× as long as pronotum. Scutellum about as long as mesoscutum, with transverse row of fovea extending to lateral margins; distance between placoid sensilla about 1.6-2.2× as long as their own diameter. Propodeum with strong reticulate sculpture medially, less conspicuous laterally, about as long as mesoscutum, with one pair of tooth-like projections posterolaterally and 2-3 fine setae.
Forewing (Fig. 14) 4.0-4.2× as long as wide, longest marginal setae about 0.20-0.25× as long as greatest wing width. Beneath or on the submarginal vein with 8-13 setae. Marginal vein with 8-10 setae along anterior margin. Hind wing (Fig. 15) 7.2-7.6× as long as wide, longest marginal setae about as long as greatest wing width, with 1 long seta and 1 short seta on marginal vein, and a group of notably long setae on disc behind the distal part of marginal vein. Petiole (Fig. 19) about 1.5× as long as wide, with relatively long spine-like projections anterolaterally. Gaster oblong, 0.86-1.05× as long as mesosoma; Gt 1 and Gs 1 with numerous prominent and sclerotized carinae. Ovipositor not or only slightly exserted, about 0.68× as long as mesotibia (Fig. 17).
Measurements ( Diagnosis. Vertex entirely covered with conspicuous scale-like sculpture; pronotum with a faint longitudinal carina medially; propodeum with strong reticulate sculpture medially, less conspicuous laterally; hind wing with 3-6 long setae and 1 short seta on marginal vein, disc uniformly setose; petiole with relatively short spine-like projections anterolaterally; ovipositor 0.87-0.90× as long as mesotibia. Description. Female. Body length 0.9-1.1 mm. Head black with ocelli and mandibles brown and eyes pinkish. Antenna dark brown with radicle yellowish-brown. Mesosoma black with pronotum dark brown. Wings infuscate, with base of forewing under the venation dark brown, and two transparent spots, one on the behind the api- Head (Fig. 20) 1.1× as long as wide. Eye subtriangular, 1.8-2.0× as long as wide, finely setose, each seta about as long as the diameter of a facet. Vertex about as long as wide, with conspicuous scale-like sculpture entirely, its posterior margin 1.6-1.7× as long as anterior margin. Ocelli in an obtuse triangle; mid ocellus oval, MOL shorter than OD; post ocellus oval, OCL approximately a little shorter than POD; POL about 3.4-4.0× as long as OOL. Mandible (Fig. 21) 0.6× as long as head and 0.8× as long as vertex in dorsal view. Antenna (Fig. 22) with radicle 0.15-0.25× as long as scape; scape 4.5-5.3× as long as wide; pedicel 1.4-1.7× as long as wide, and 2.4-2.7× as long as fl 1 ; fl 2 -fl 6 each with 2 mps; clava shorter than scape, 2.4-2.7× as long as wide, with 8 mps.