侧沟茧蜂属二新种记述(膜翅目,茧蜂科)

记述了采自福建武夷山、浙江(龙王山、百山祖)、湖北神农架、山东崂山和黑龙江镜泊湖等地的侧沟茧蜂属Microplitis Foerster 2新种。两色侧沟茧蜂Microplitis bicol-oratus sp．nov．(♀)和长径侧沟茧蜂Microplitis longiradiusis sp．nov．(♀)。两色侧沟茧蜂Microplitis bicoloratus与M．obscuripennis Xu and He相似，但以下特征与之区别：1)前后单眼间距与单眼直径等长(后者小于单眼直径)；2)中胸盾片具一宽而深的中纵沟，且内具小脊(后者无中纵沟)；3)后翅后小脉直(后者明显弯向翅基)；4)翅半透明，淡烟褐色，前翅翅痣下方具一暗色斑(后者翅不透明，一致暗烟褐色)；5)后足胫节中部具1黄白色环(后者为一致黑色)。采自福建、浙江、湖北和山东。长径侧沟茧蜂Microplitis longiradiusis与M．marshalli Kokujev相似，但以下特征与之区别：1)后单眼间距与单复眼间距等长(后者短于单复眼间距)；2)腹部第2～3背板红黄色(后者黑色)；3)后足基节红黄色(后者黑色)；4)前翅r脉短于2-SR脉(后者与2-SR脉等长)；5)前翅1-R1脉特别短，约与翅痣等长(后者明显长于翅痣长)。采自黑龙江。本文附中国侧沟茧蜂属种类检索表。模式标本均保存在浙江大学植保系寄生蜂标本室。

TWO NEW SPECIES OF MICROPLITIS FOERSTER FROM CHINA (HYMENOPTERA, BRACONIDAE, MICROGASTRINAE)

Two new species of Microplitis Foerster 1862, viz: Microplitis longiradiusis sp. nov. ( ♀ ) and Microplitis bicolProvinces and is closely related to M. obscuripennatus Xu et He, but differs from the latter in the combination of the following features: 1) APOL as long as OD; 2) mesoscutum with a wide and deep medio-longitudinal crenulate furrow; 3) cu-a of hind wing straight; 4) Wings subhyaline, pale to infuscate, and fore-wing with a dark spot beneath stigma; 5) hind tibia with a yellowish-white middle ring. Microplitis longiradiusis sp. nov. is described from Heilongjiang Province and is closely related to M. marshalli Kokujev, but differs from the latter in the combination of the following features: 1) APOL as long as OD; 2)tergites 2-3 reddish yellow; 3) hind coxa reddish yellow; 4) r of fore wing shorter than 2-SR; 5) 1-R1 of fore wing very short,almost as long as stigma. A key to Chinese species of Microplitis Foerster is provided. The type specimens are deposited in Zhejiang University, Hangzhou, China.