none no species In the present paper 11 new species are described. Among them some of species has played an important role in the pest control. The type specimens are kept in the Insect Specimen Lab of Forestry Academy of Northwestern Sci-Tech. University of Agriculture and Forestry. 1. Anagyrus pergandei, sp. nov.: This new species is similar to A. dactyopii (Howand), however, the ocelli arrangement of the former is obtuse-angled triangle, but the latter one is sharp-angled triangle. The length of abdomen is equal to that of brisket, but the latter one is equal to the total length of head and brisket. Host: Phenacoccus pergandei Ckll. Holotype: [female]; paratypes: 1 [female] 3 [male] [male], Fuping County, Shaanxi Province, 05-VI-1989, Zhang Zhan-lao. 2. Anagyrus nesticoccus, sp. nov.: This new species is similar to A. fujikona Tachikawa, however, the length of antenna scape of the former is 1.5[approximately]1. 7 times as its width, the latter one is 2 times. The color of notum in both brisket and abdomen of the former is yellowish orange, and the latter one is black. Host: Nesticoccus sinensis Tang. Holotype: [female], paratype: 1 [female]. Zhouzhi County, Shaanxi Province, 20-V-1981, Qu Bang-xuan. 3. Copidosoma dioryctria, sp. nov.: This new species is similar to C. kushkense Myartsera, however, the body of the former is slenderness, and the length of clavus is equal to the total of the ended 4 funicles. The body of the latter is erroneous and the length of clavus is equal to the total of the ended 5 funicles. Host: Dioryctria pryeri Ragonot. Holotype: [female], paratype: 1 [female], Huangling County. Shaanxi Province, 03-VII-1963, Li Kuan-sheng. 4. Copidosoma hanzhongenum, sp. nov: This new species is similar to C. floridanum Ashmead. The reticulate pattern in mesoscutum for the former is roughly wider than that in scutellum, the reticulate pattern for the latter is just opposite as the former. The clavus for the former is not segmentation; that for the latter is 3 segments. This new species is also similar to C. agrotis, however, no brown spot under the marginal vein of its fore wing, but brown spot in the latter. Host: larva of Noctuidae. Holotype: [female], paratypes: 9 [female] [female], Hanzhong County, Shaanxi Province, 20-VII-1980, Wang Ai-xue. 5. Copidosoma malacosoma, sp. nov.: This new species is similar to C. clavatum Myartseva. However, the mesoscutum for the former is black, that for the latter is verdigris; the scutellum for the former is black, that for the latter is dark purple. Host: Malacosoma neustria Motsch. Holotype: [female], paratypes: 3 [female] [female], Tongchuan County, Shaanxi Province, 05-V-1978, Dang Xin-de. 6. Echthrodryinus aphidius, sp. nov.: This new species is similar to E. azureus (Mercet), however, the antenna funicle for the former is dark yellow, the latter one is black brown; the mesoscutum for the former is black, that for the latter is dark purple. Host: Aphidius sp. Holotype: [female], paratypes: 9 [female] [female], Dali County, Shaanxi Province, 10-V-1980, Wang Ai-xue. 7. Metaphycus eriococcus, sp. nov.: This new species is similar to M. pulvinariae (Howard), however, the antenna clavus for the female is straw yellow, that for the latter one is black brown; the color all tibiae of legs is uniform, but 2 brown loops in tibia for latter. Host: Eriococcus kaki Kuwana. Holotype: [female], paratypes: 5 [female] [female], Luonan County, Shaanxi Province, 02-VI-1983. Sun Yong-kang. 8. Metaphycus phenacoccus, sp. nov.: This new species is similar to M. albopleuralis (Ashmead), however, the mesopleuron for the former is yellow, that for the latter is white; the antenna clavus for the former is slightly intumescent and elliptic shape, the antenna clavus for the latter is obvious intumescent and near round shape. Host: Pulvinria sp. Holotype: [female], paratypes: 4 [female] [female], Luonan County, Shaanxi Province, 02-VI-1983, Sun Yong-kang. 9. Metaphycus qinlingensis, sp. nov.: This new species is similar to M. angustifrons Comper, but the body length of the former is more than 1.3 mm, that of the latter is about 0.8 mm; the distance between ocelli is 2 times as ocellus diameter, however, that of latter one is equal to ocellus diameter. Host: Lecanium sp. Holotype: [female], paratypes: 5 [female] [female] 3 [male] [male], Luonan County, Shaanxi Province, 13-VI-1983, Sun Yong-kang. 10. Metaphycus shaanxiensis, sp. nov.: This new species is similar to M. nitens (Kurdjumov), however, the body length of the former is more than 1.2 mm, that of the latter is 0.69 mm[approximately]1.2 mm, the funicle in antenna is grandually intumescent, the ended 2 funicles for the latter is obviously intumescent; the top of antenna clavus in female for the former is beveling shape, that for the latter is symmetric. Host: Lecanium sp. Holotype: [female], paratypes: 4 [female] [female] 2 [male] [male], Luonan County, Shaanxi Province, 27-IX-1983, Sun Yong-kang. 11. Trichomasthus quadraspidiotus, sp. nov.: This new species is similar to Tr. kurentzovi Trjapitzin. The arrangement of ocelli for the former is sharp-angled with 40[degree], that of the latter is sharp-angled with 25[degree], the distance between lateral ocelli and middle ocellus is 2 times that of between two ocelli, that for the latter is 3 times. Host: Quadraspidiotus perniciosus (Comstock). Holotype: [female], paratype: 1 [female], Luonan County, Shaanxi Province, 10-VI-1983, Sun Yong-kang. Anagyrus nesticoccus (Encyrtidae); Sp nov; Shaanxi; Parasite of Nesticoccus sinensis (Hemiptera), in Chinese, p. 290 [English p. 298] Anagyrus pergandei (Encyrtidae); Sp nov; Shaanxi; Parasite of Phenacoccus pergandei (Hemiptera), in Chinese, p. 289 [English p. 298] Copidosoma dioryctria (Encyrtidae); Sp nov; Shaanxi; Parasite of Dioryctria pryeri (Lepidoptera), in Chinese, p. 291 [English p. 298] Copidosoma hanzhongenum (Encyrtidae); Sp nov; Shaanxi; Parasite of Noctuidae (Lepidoptera), in Chinese, p. 291 [English p. 299] Copidosoma malacosoma (Encyrtidae); Sp nov; Shaanxi; Parasite of Malacosoma neustria (Lepidoptera), in Chinese, p. 292 [English p. 299] Echthrodryinus aphidius (Encyrtidae); Sp nov; Shaanxi; Parasite of Aphidius (Hymenoptera), in Chinese, p. 293 [English p. 299] Metaphycus eriococcus (Encyrtidae); Sp nov; Shaanxi; Parasite of Eriococcus kaki (Hemiptera), in Chinese, p. 293 [English p. 299] Metaphycus luonanensis (Encyrtidae); Sp nov; Shaanxi; Parasite of Pulvinaria (Hemiptera), in Chinese, p. 294 [English p. 299]; Also spelt Metaphycus phenacoccus Metaphycus qinlingensis (Encyrtidae); Sp nov; Shaanxi; Parasite of Lecanium (Hemiptera), in Chinese, p. 295 [English p. 300] Metaphycus shaanxiensis (Encyrtidae); Sp nov; Shaanxi; Parasite of Lecanium (Hemiptera), in Chinese, p. 295 [English p. 300] Trichomasthus quadraspidiotus (Encyrtidae); Sp nov; Shaanxi; Parasite of Quadraspidiotus perniciosus (Hemiptera), in Chinese, p. 296 [English p. 300]