丝角叶蜂属一新种（膜翅目：叶蜂科）

A New Species of the Genus Nematus(Hymenoptera : Tenthredinidae)from China

本文记述叶蜂科、丝角叶蜂亚科一新种——杏丝角叶蜂Ｎｅｍａｔｕｓｐｒｕｎｉｖｏｒｏｕｓ。本种在浙江省淳安县严重危害杏树。

This paper reports a new species of the genus Nematus N. prunivorousXiao from China. It is injurious to Prunus armeniaca L. in Chunan County, ZhejiangProvince. Female:Black with purpulish blue lustre. Antennae black or blackish brown;mandibleblack with blackish red teeth;lateral sides and center of supraclypeal area each with a palepart.Cenchri deep yellow;wing hyaline with apical part slightly infuscated;stigma blacksometimes with a obsolete yellow spot on basal part;costa,basal part of anal vein blackishyellow;other veins black;leg black with apices of coxae,trochanters,basal parts of femoraand tibiae yellowish white :tarsi blackish brown or black.Pubescence on head and thoraxyellowish brown. Anterior margin of clypeus deeply imarginated,nearly arcuate;frontal carina distinct;median fovea round,small and shallow;lateral sutures deep;transverse and coronal suturesdistinct;OOL :POL :OCL=1.1:1.0:1.1;antennal length about 22/3 times head width;head behind eye in dorsal view widened;Pubescence on clypeus and labrum long and dense.Lancet see fig.1-1. Head finely and sparsely punctate; mesonotum except for scutellum with fine and densepunctures;mesepisterum with very fine and sparse punctures, interspace between punctures1～2 times diameter of puncture;abdomen without punctures but wirh obliquely distributedsculptures. Body length 10 mm;relative lengths of antennal segments=1.7:1.0:7.9:8.1:7.8 :5.9:5.8:5.2:5.3. Malk:color similar to female, but fore and median tibiae paler andyellow spot on basal part of stigma sometimes more distinct;OOL :POL :OCL=1. 6:1.0:1.7;antennal length about 21/3 times head width;head behind eye in dorsal view not widened;Penis valve see fig.1-2.Pubescence on head, mesoscutum,mesepisterum coarse and dense,rugose;ab- dominal terga 4～8 with coarse punctures. Body length 9 mm;relative length of antennal segments=1.5:1.0:5.6:5.9:5.8:4.8:4.5:4.2:4.5.Other characters as for the female.Holotype♀,Chunan County,Zhejiang Province,15.Ⅳ.1994,Zhao Jinnian leg,Allo- type♂, same data as for holotype. Paratypes 1 ♂,4♀♀,same as holotype;3♀♀ same lo- cality and collector as holotype,8.Ⅴ.1990. Host :Prunus armeniaca L. The new species resembles Nematus caeruleocarpus Hartig,but differs from the latter in the color of wings and legs and the structural features of the lancet and penis valve.The type specimens are kept in the insect collection of the Institute of Forest Protection,the Chinese Academy of Forestry.