A new species of Amphibulus Kriechbaumer (Hymenoptera, Ichneumonidae, Cryptinae) from Beijing with a key to species known from the Oriental and Eastern Palaearctic regions

Abstract A new species, Amphibulus melanarius Zong, Sun & Sheng, sp.n., belonging to the tribe Phygadeuontini of the subfamily Cryptinae (Hymenoptera: Ichneumonidae), collected from Beijing, China, is reported. A key to the species of the genus Amphibulus Kriechbaumer, 1893 known in the Oriental and Eastern Palaearctic Regions is provided.


Introduction
Amphibulus Kriechbaumer, 1893, belonging to the subtribe Endaseina of tribe Phygadeuontini (Hymenoptera, Ichneumonidae, Cryptinae), comprises 26 described species (Yu et al. 2012), of which two are from the Oriental Region (one also from the Eastern Palaearctic Region) (Luhman 1991), three from the Eastern Palaearctic, two from the Western Palaearctic, six from the Nearctic, 15 from the Neotropical and one from the Afrotropical Regions (Yu et al. 2012).
The European species of the genus Amphibulus were revised by Sawoniewicz (1990). A revision with 22 new species and a key to the world species was produced by Luhman (1991). Two species have been reported from China (Luhman 1991;Sheng 1999Sheng , 2009. A key to the genera of Endaseina found in China, including Carinityla Sheng & Sun, 2010, was provided by Sheng and Sun (2013). The status of Amphibulus was defined by Townes (1970) and Luhman (1991).
In this article a new species of Amphibulus, collected in Beijing, situated at the southern border of the Eastern Palaearctic part of China, is reported.
Images of whole bodies were taken using a CANON Power Shot A650 IS. Other images were taken using a Cool SNAP 3CCD attached to a Zeiss Discovery V8 Stereomicroscope and captured with QCapture Pro version 5.1. Morphological terminology is mostly based on Gauld (1991). Wing vein nomenclature follows Mason (1986Mason ( , 1990 Description. Female (Figs 1-11). Body length 6.5 to 7.5 mm. Fore wing length 5.5 to 6.0 mm. Ovipositor sheath length approximately 1.0 mm.
Head. Face and clypeus with dense brown hairs. Face (Fig. 2) 2.6 to 2.7 times as wide as long, median portion slightly convex; with dense punctures. Clypeus 3.0 to 3.3× as wide as long, basal half with dense punctures, apical half smooth and shiny, with unclear, indistinct striations; subapical portion distinctly raised as a transverse ridge; apical margin deeply depressed, median section almost truncate. Mandible (Fig. 3) distinctly elongate, shiny, with sparse, fine punctures; base distinctly concave centrally; upper tooth evidently longer than lower tooth. Subocular sulcus indistinct. Malar space 0.55 to 0.6 times as long as basal width of mandible. Gena in dorsal view 1.1 to 1.2× as long as width of eye, with uneven, fine punctures, distance between punctures 0.5 to 4.0× their diameter. Vertex (Fig. 4) slightly shining, with irregular elongate punctures. Postocellar line 0.83 to 0.88× as long as ocular-ocellar line. Upper portion of frons almost flat, with dense punctures, distance between punctures 0.2 to 1.0× their diameter; mediocentral portion with fine transverse wrinkles; lower portion concave, smooth, shiny, with median longitudinal carina. Antenna with 25 or 26 flagellomeres, median portion of flagellum, flagellomeres 5 to 21, slightly widened; apical half cylindric. Ratios of lengths from first to fifth flagellomeres: 1.1:1.0:1.1:0.9:0.8. Apical truncation of scape 15 to 18 degrees from transverse. Occipital carina complete, lower end joining hypostomal carina at base of mandible.
Metasoma (Fig. 10). First tergite approximately 1.35 to 1.5× as long as apical width. Postpetiole approximately 0.75 as long as wide, with dense, fine longitudinal wrinkles. Dorsolateral and ventrolateral carinae complete. Spiracle circular, small, located approximately at posterior 0.3 of first tergite. Second tergite 0.5 to 0.6× as long as wide, with fine punctures, punctures on posterior portion much sparser and finer than that on anterior portion. Third tergite 0.6 to 0.7× as long as wide, anterior portion with fine, indistinct punctures, posterior almost smooth. Tergites 4 and 5 with dense brown hairs. Ovipositor (Fig. 11) with weak subapical nodus.
Color (Fig. 1). Black, except the following: anterior profiles of scape and pedicel, basal portion and anterior profile of apical half of flagellum slightly reddish black. Flagellomeres 5 to 10 (11) white. Apical portion of clypeus, mandible except base and teeth, maxillary and labial palpi, tegula, front and middle legs, hind coxa, trochanter, and base and ventral profile of femur, basal portion of hind tibia red to reddish brown. Dorsal surface of hind femur and apical portion of hind tibia dark brown. Hind tarsus brown to brownish black. Pterostigma and wing veins brownish black.