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

This paper reports a new species of the genus Nematus——N. prunivorous Xiao from China. It is injurious to Prunus armeniaca L. in Chunan County, Zhejiang Province. Female:Black with purpulish blue lustre. Antennae black or blackish brown;mandible black with blackish red teeth;lateral sides and center of supraclypeal area each with a pale part.Cenchri deep yellow;wing hyaline with apical part slightly infuscated;stigma black sometimes with a obsolete yellow spot on basal part;costa,basal part of anal vein blackish yellow;other veins black;leg black with apices of coxae,trochanters,basal parts of femora and tibiae yellowish white:tarsi blackish brown or black.Pubescence on head and thorax yellowish brown. Anterior margin of clypeus deeply imarginated,nearly arcuate;frontal carina distinct;median fovea round,small and shallow;lateral sutures deep;transverse and coronal sutures distinct;OOL:POL:OCL=1.1:1.0:1.1;antennal length about 2 2/3 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 2 1/3 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.