The genus Arhaconotus Belokobylskij (Hymenoptera, Braconidae, Doryctinae) from China, with description of a new species

Abstract The genus Arhaconotus Belokobylskij (Hymenoptera: Braconidae, Doryctinae) is recorded for the first time from China. A new species of this genus, Arhaconotus hainanensis Tang & Chen, sp. n., is described and illustrated. A key to the species of this genus is updated to include the new species.


Introduction
Th e genus Arhaconotus Belokobylskij (Hymenoptera, Braconidae, Doryctinae) was described in 2000 by S.A. Belokobylskij (Belokobylskij 2000). To date three species of the genus have been described, of which one occurs in the Australasian region and two in the Oriental region (Belokobylskij 2000(Belokobylskij , 2001. During our study of Chinese Braconidae, we discovered a new species of this genus. It represents the fi rst record of this genus from China. In the present paper, the new species, A. hainanensis Tang & Chen, sp. n., is described and illustrated and an updated key to the genus Arhaconotus is added.

Material and methods
Th e terminology and measurements used follow van Achterberg (1979,1988). Additional sources for the description of sculpture and setation are Belokobylskij (2001). All descriptions and measurements were made under a Leica MZ 12.5 microscope, and all fi gures were made by a digital camera (Q-Imaging, Micropublisher, 3.3 RTV) attached to a stereomicroscope (Leica MZ APO, Germany) and Auto-Montage Pro version 5.0 software. Type specimens and other materials are deposited in the Parasitic Hymenoptera Collection of the Zhejiang University, Hangzhou, China (ZJUH).
Description. Female. Body length 3.2 mm; fore wing length 2.9 mm. Head. Width 1.4 times its median length. Antennae slender, almost fi liform, 32-segmented. Scapus 1.6 times as long as maximum width. First fl agellar segment 6 times as long as its apical width, almost equal to second segment. Penultimate segment 4.8 times as long as wide, 0.7 times as long as fi rst segment, 0.9 times as long as apical segment. Eye 2.6 times as long as temple in dorsal view. Ocelli medium-sized, in triangle with base almost equal to its sides. POL: OD: OOL= 3: 3: 6. Temple fi nely granulate ventrally. Vertex and frons densely granulate. Vertex with very sparse, short setosity. Eye glabrous, 1.2 times as high as broad. Face fi nely granulate-coriaceous, its width 1.2 times height of eye, 1.4 times height of face and clypeus combined. Malar space 0.3 times height of eye, 0.7 times as long as basal width of mandible. Malar suture absent. Occipital carina complete dorsally, not fused with hypostomal carina ventrally.
Wings. Fore wing 3.3 times as long as maximum width. Vein r arising slightly before middle of pterostigma. 3-RS forming very obtuse angle with r. 3-RS: r: SR1= 24: 9: 40. Second submarginal cell large, 3 times as long as maximum width, 1.4 times as long as fi rst subdiscal cell, almost equal to fi rst discal cell. 1-SR+R weakly S-curved. m-cu postfurcal. 1-CU1 almost equal to cu-a. Cu1a interstitial. Hind wing, M+CU 0.6 times as long as 1-M. m-cu weakly curved, antefurcal and pigmented.
Legs. Hind coxa granulate. Hind femur coriaceous, 3.3 times as long as wide, with weak dorsal protuberance. Hind tibia with rather long, dense setae dorsally. Hind tarsus almost as long as hind tibia. Hind basitarsus 0.8 times as long as second-fi fth segments combined; second tarsal segment 0.4 times as long as basitarsus, 1.3 times as long as fi fth segment (excluding pretarsus).
Metasoma. Almost as long as mesosoma and head combined, with 6 visible tergites. First tergite entirely, distinctly longitudinally striate, its apical width 1.6 times its minimum width; its length 1.2 times as long as its maximum width. At most part of second tergite distinctly longitudinally striate, with a distinctly separated, smooth basal area and a rather wide smooth apical area, median length of second tergite 0.7 times as long as its basal width. Second suture deep and wide. Second-fi fth tergites densely striate-punctulate in entire lateral parts. Th ird-fi fth tergites in basal halves (their apical halves smooth) distinctly longitudinally striate. Sixth tergite rather large, densely punctulate on basal half, semicircularly striate on apical half, regularly rounded on apical margin with a shallow median emargination. Ovipositor sheath 1.2 times as long as metasoma and 0.6 times as long as fore wing.
Colour. Head reddish yellow. Mesonotum and apex of metasoma reddish brown; rest part of mesosoma and metasoma black. Basal quarter of antenna reddish brown, remainder dark reddish brown to black. Palpi pale yellow. Legs entirely yellow, sometimes hind coxa infuscate. Ovipositor sheath dark brown, paler basally. Wings faintly infuscate. Pterostigma brown, yellow in basal third and in apical 1/4. Male. Unknown. Variation. Body length 2.8-2.9 mm; fore wing length 2.6-2.7 mm. Fore wing 3.9 times as long as maximum width, 3-RS: r: SR1=21: 6: 39. Second submarginal cell 3 times as long as maximum width. Median length of second tergite 0.8 as long as its basal width.
Diagnosis. Th is new species is similar to A. vietnamicus Belokobylskij, but differs in antenna longer; sixth tergite densely punctulate on basal half and semicircu-larly striate on apical half, its apical margin with a shallow median emargination; second to fi fth tergites densely striate-punctulate in entire lateral parts, and metasoma black.
Distribution. China (Hainan). Etymology. From the Hainan province, type locality of the species.