FOUR NEW SPECIES OF SAWFLIES FROM CHINA (HYMENOPTERA,SYMPHYTA:PAMPHILIIDAE,TENTHREDINIDAE)

Four new species of sawflies from China are described in this paper.Three of them are forest insect pests.The type specimens are deposited in the collection of forest insects in the Research Institute of Forestry CAF.1.Acantholyda flavalbimarginata n.sp.(figs.1,2,3) Host: Pinus yunnanensis Franch.Holotype,Yunan Province,Huaping County,6.XI.1989,Wong Yong-xian,1800m.Allotype,same as holotype.Paratypes 4,4,same as holotype.The new species is related to Acantholyda flavomarginata Maa,but differs from the latter in the yellowish white lateral parts of terga,in the yellowish white parts of 1~7 stera and in the color patterns of the adult head.2.Eutomostethus nigritus n.sp.(figs.4,5) Host: Phyllostachys pubescens Mazel ex H.de Lehaie.Holotype,Zhejiang Province,Deqing County,5.IX.1986,Wong Maozhi.Allotype,same as holotype.Paratypes 3,4,same as holotype.The new species is closely related to Eutomostethus gagathinus (Klug),but it can be separated from the latter by the yellowish first and second tarsite of the fore and middle legs,and by the fact that there is no coriaceous spot in the second cubital cell.3.Nematus hequensis n.sp.(figs.6,7,8) Host: Populus×canadensis Moench (P.euramericana (Dode) Guinier),Salix gordejevii Chang et Skov.Holotype,Shanxi Province,Hequ County,1980,Yan Juexing ang Zhao Fengyuan.Allotype,same as holotype.Paratypes 3,3,same as holotype;2,1,Nei Mongol Autonomous Region,Ih Ju League (Dong-sheng County),11.VIII.1985,Gao Fenglin.The reddish yellow head,thorax,and the features of the lancet and the penis valve make this species very easily recognizable from all its known palaearctic congeners.4.Pristiphora huangi n.sp.(figs.9,10) Host: peach,cherry,plum,pear.Holotype,Fujiang Province (Shaxian County),16.V .1976,Huang Bong-kan.Allotype,same as holotype;Paratypes 1,3,same as holotype;1,Jiangsu Province (Nanjing City),1952.The new species resembles Pristiphora moesta (Zaddach) but differs from the latter in the black prothorax,in the pale brown and nearly translucent wings,in the dark brown costal cells and the obsolete Sc,and in the different structures of the lancet and the penis valve.