Descriptions of a new species of Foenatopus Smith from China and the male of Parastephanellus brevicoxalis (Hymenoptera, Stephanidae)

Abstract A new species of the stephanid genus Foenatopus Smith, Foenatopus weii sp. n., is described and illustrated from Yunnan Province, China. A modified section of the identification key to species of Foenatopus is added to include the new species. The male of Parastephanellus brevicoxalis Hong, van Achterberg & Xu, 2011 from Guangdong Province, China is also described and illustrated for the first time.


Introduction
The family Stephanidae Leach, 1815 are a rare group of parasitoids (Hong et al. 2011). The Chinese Stephanidae were recently revised by Hong et al. (2011), and five genera and 21 species were recognized. However, one species of Schlettererius Ashmead, 1900  and two species of Pseudomegischus van Achterberg, 2002Chen et al. 2016) were subsequently reported from China, suggesting that the actual number of Stephanidae occurring in China is still underestimated. During recent surveys of Chinese Hymenoptera some additional specimens of Stephanidae have been collected. Among them, a new species of Foenatopus is recognized and the male of Parastephanellus brevicoxalis Hong, van Achterberg & Xu, 2011 is reported for the first time. Here the new species Foenatopus weii sp. n. and the male of P. brevicoxalis Hong, van Achterberg & Xu, 2011 are described.

Material and methods
Descriptions of the species have been made under an Olympus SZ61 stereomicroscope, with lighting achieved through a 27W fluorescent lamp. Digital images were taken with a digital microscope KEYENCE® VHX-5000 (Osaka, Japan), and plates were edited with the programs ACDSee 10.0 and Photoshop CS 8.0.1.
Colour. Black (Fig. 1), except: frons laterally with short ivory streaks not reaching level of anterior coronal tooth (Fig. 2); temple brown with ivory streak along lower half of the eye, streak becoming narrow apically (Fig. 3); base of mandible yellow; most of mid tarsus ivory; subapical part of ovipositor sheath whitish (Fig. 11).
Male. Unknown. Distribution. Oriental: China (Yunnan). Biology. Collected in July. Host not known. In the key to species of the genus Foenatopus by Hong et al. (2011), the new species can be included by replacing couplet 8 as follows: 8 Middle pale stripe of frons comparatively wide dorsally (Figs 124, 133 in Hong et al. 2011) and base of anterior tooth of corona yellowish-brown; pronotum often yellowish-brown or dark brown posteriorly and usually contrasting with black mesoscutum (Figs 127, 151 l.c.); teeth of hind femur completely to partly pale yellowish or ivory (Fig. 129 l.c.)  Pronotum with posterior half distinctly striate or carinate (Figs 175, 176 l.c.); face of female without distinct pale lateral stripes (Fig. 182 l.c.); frons comparatively coarsely sculptured (Fig. 182 l.c.)  Ovipositor sheath completely black (Fig. 54 l.c.); anterior half of pronotum in lateral view without transverse carinae and flat medially or slightly impressed (Fig. 51 l.c.); fore wing with vein 2-CU1 absent (Fig. 49 l.c.)  Colour. Black (Fig. 12), except: frons yellowish-brown; coronal teeth, vertex medio-longitudinally and narrow area of vertex behind eyes dark brown, remainder of vertex reddish-brown; temple yellowish-brown with yellow streaks along eye; base of mandible yellow; palpi, scape, pedicel yellowish-brown; propleuron largely dark brown; fore leg, tibiae and tarsi of mid and hind legs yellowish-brown; hind trochanter and base of second tergite reddish-brown; wing membrane subhyaline; pterostigma and wing venation dark brown.
Metasoma. First tergite 7.5 × as long as its maximum width, 2.6 × as long as second tergite and 0.8 × as long as remainder of metasoma, densely coarsely and rather regularly transversely striate, basal 0.1 rugose and with 2 distinct, short longitudinal carinae, apically narrowly smooth; basal 0.2 of second tergite with several short longitudinal carinae, remainder of tergite smooth; remainder of tergites densely finely microaciculate; pygidial process distinct and tubular apically.
Distribution. Oriental: China (Zhejiang, Guangdong). Biology. Collected in July and October. Host not known. Remark. The male is similar to the female, except: body smaller (female body length 16.2 mm); head paler; antenna with 28 segments (33 segments in female); propleuron largely coriaceous, smooth medially (coriaceous and microreticulate in female); vein 1-M 1.9 × as long as vein 1-SR and 1.2 × as long as vein m-cu (vein 1-M 1.25 × as long as vein 1-SR and 0.9 × as long as vein m-cu in female); vein r ends at level of apex rather than behind of pterostigma; first tergite elongate, considerably longer than second tergite.