First record of Imasega Krombein from China , with description of one new species ( Hymenoptera , Chrysididae , Amiseginae )

The genus Imasega Krombein, 1983 is recorded from China for the first time, and one new species, I. bicolor Li & Xu, sp. n. (China: Guangdong) is described and illustrated. An updated diagnosis of the genus and a key to species are provided.

First record of Imasega Krombein from China, with description of one new species (Hymenoptera, Chrysididae, Amiseginae)

Introduction
The genus Imasega was erected in the subfamily Amiseginae by Krombein (1983) to accommodate the single species, I. rufithorax Krombein, 1983 with four males of the type species from Sri Lanka.The genus Imasega Krombein resembles Kryptosega Kimsey, 1986 in having flagellomeres 2-9 at least 2.0 × as long as wide, malar space with vertical sulcus, pronotum with median groove posteriorly, mesopleuron without scrobal sulcus or omaulus, and hind coxa without dorsobasal carina; but differs from the latter by: prothorax yellowish brown, clypeal apex thickened, occipital carina absent, propodeum with blunt posterolateral tooth (Kimsey and Bohart 1991;Li and Xu 2016).
At present, the type species I. rufithorax Krombein is only known from Sri Lanka and the genus is unknown in China.In the course of our survey on the Chinese Chrysididae fauna, one new species of the genus Imasega was discovered and described herein.

Materials and methods
The specimens were examined and described under stereomicroscope Leica MZ125.Photographs were taken with a digital camera CoolSNAP attached to Zeiss stereomicroscope Stemi 2000-CS.Images were processed using Image-Pro Plus software.
The holotype and paratypes of the new species are deposited in the Hymenopteran Collection of South China Agricultural University, Guangzhou (SCAU).The specimen of Imasega rufithorax Krombein (identified by Krombein in 1984) which is deposited in the Bohart Museum of Entomology, University of California, Davis, USA, was examined for comparison in this study.Head.Head with setulae.Head 1.4 × as wide as distance from clypeal apex to posterior ocelli.Head (except scapal basin) punctate; punctures interspaced by 0.2-1.0PD.Scapal basin slightly concave, with faint transverse rugulae and smooth longitudinal median ridge.Eye strongly bulging and with dense, erect setulae.Clypeal apex thickened.Mandible with one tooth.MS less than half of eye height.Ocellar triangle obtuse isosceles.Flagellum with dense, oblique setulae; flagellar setulae about   half as long as width of flagellar segment; F1 4.5 × as long as wide; F2 3.4 × as long as wide; F3 3.4 × as long as wide; F4 3.7 × as long as wide; F5 3.8 × as long as wide; F6 4.2 × as long as wide; F7 4.3 × as long as wide; F8 4.4 × as long as wide.Occipital carina absent.