脊颜茎蜂属评述暨一新种(膜翅目:茎蜂科)

On the genus Tibetajanus Wei(Hymenoptera:Cephidae)with description of a new species

基于模式标本和新材料研究了茎蜂科脊颜茎蜂属,修订了该属属征和主要鉴别特征。该属唇基上区具锐利中脊,下唇须第4节短,明显宽于下颚须第4节,左上额粗短,中部显著弯折,雄虫多数鞭分节腹侧钝齿状突出,雌虫部分锯刃具多列亚基齿等特征,与茎蜂科其余各属均不相同。描述了脊颜茎蜂属1新种,采集自江西和湖南南部山区。编制了种检索表。

The genus Tibetajanus Wei,1996 is reviewed based on holotypes and new material.The genus is unique among the genera of Cephidae by the supraclypeal area with a sharp middle keel,the forth labial palpus short and clearly broader than the forth maxillary palpus,left mandible short and strongly bent at middle,most of the flagellomeres in male serrate ventrally,the middle serrulae of female lancet with fine teeth.A new species,T.circularis sp.nov.,is described from the southern mountainous regions of Jiangxi and Hunan Provinces,China.A key to known species of this genus is provided.