Abstract: The present paper describes a new pteromalid species, Norbanus aiolomorphi. It parasitizes the larva and pupa of mosobamboo eurytomid, Aiolomorphus rhopaloides Walker, 1871(Hymenoptera:Chalcidoidea, Eurytomidae) whichmakes galls on the branchlets of moso-bamboo(Phyllostachys pubescens Mazel) and is a serious pest for the plant in most parts of South China. Norbanus aiolomorphi Yang et Wang, sp. nov. (Figs1-6) Female: 3.2-4.6 mm long. Black, hardly nitidus; basal part of gasterhaving a lemon-yellow spot; antenna yellow brown; legs with coxae black,femora and pretarsi dark brown, tarsi and the apex 1/2 of hind tibia yellowwhite, the others yellow brown; wings hyaline. Head and thorax densely raisedreticulate. Relative measurement: Headwidth 66, height 54, POL 12, OOL 16, frons width 46, the distance betweenthe upper margin of torulus and median ocellus 14, between its lower marginand apex of clypeus 35, malar space 15, scape plus radicula 36, pedicellusplus flagellum 95; thorax 78:56, pronotum median length 7, mesoscutum 29,scutellum 28 (width 32), propodeum 14; marginal vein 36, postmarginal 21,stigmal vein 10; gaster 102:46. Ovipositor not exerted. lst gaster tergite having its hind margin slightly trilobed. The last tarsus expanded, particulalyin female which has it as wide as the intumescent tibia, and with pretarsusvexillum obviously (Fig.6). Male: 2.8-3.9mm long. Similar to female. Its antenna extremely long(Fig. 4), flagellum plus pedicellus 1.02-1.11 times the length of head,thorax and gaster combined and 2.94-3.04 times the width of head; flagellumwith irregular whorles of long dense erect setae on each segment which isnever nodulated; scape curved seriously with broad emargination dorsally onbasal 2/3; legs relatively slender, last tarsus thiner than the tibia; gasterlongelliptical, its length about as long as thorax (72:74), width distinctlynarrower than head and thorax(19:62:52). The new species is close to the Australian pteromalid N. longifasciatus(Girault), 1914, but may be distinguished from the latter by the charactersbelow:1)the new species with female clava gradually sharpening into an sturdyprocess apically; 2) last tarsus expanded extremely, particularly in female;3)gaster sublanceolate with apex sharpening. Biology: Parasitoid of larva and pupa of Aiolomorphus rhopaloides on bamboo Phyllostachys pubescens. Six generations from the beginning of May tothe end of October in a year have been observed and total parasitizing rarateio reached 36.6%. It has played a significant role of controlling the population of the insect pest in the bamboo growing areas of South China. Distribution: Hunan Prov. , probably all the bamboo growing areas inChina. Types: Holotype♀, Hejiadong, Shuangpai Couty, Hunan Prov., 300-600m elev., 1990-X-15, ex bamboo branchlet galls of A. rhopaloides, WangWenxue. Paratypes 12♀♀6(?)(?), same data as for holotype; 10♀♀4(?)(?), thesuburb of Zhuzhou City, Hunan Prov., 80m elev., 1990-IX-16 , Wang Wenxue (All the type specimens above are deposited in the Insect Natural Enemies Research Laboratory, Northwestern College of Forestry); 30♀♀30(?)(?),same data as for holotype(deposited in the Insect Collection of Central SouthForestry College).

Key words: Hymenopter, Chalcidoidea, Pteromalidae, Norbanus, New spcies, Biology