| This paper is based upon the examination of 1, 855 slide - mounted specimens mainly collected by sweeping from Xinjiang , China. It consists of 16 valid genera and 38 species of Trichogrammatidae (including 16 species new to science, 2 genera and 6 species new records for China), 16 valid genera and 54 species of Mymaridae (among which, 22 species are new to science, 1 genus and 13 species are new records for China).The paper comprises 3 parts: General account , geographical distribution and fauna component of trichogrammatids and mymarids in Xinjiang and Taxonomic part. In General part, the taxonomic history, morphology, biology, hosts records and the apply on the biological control etc. are briefly reviewed.In the second part, the general geographical features of Xinjiang is described and the characters of geographical distribution and fauna component of trichogrammatids and mymarids in Xinjiang are analyzed briefly , characteristics of faunal components of Trichogrammatidae in Xinjiang is summarized as follows : Endemic species are the most , the next are Widely-distributed species , Palearctic species (including Centre-Asiatic species, Pan-palearctic species and Asiatic species) and Oriental species. The composition of Mymaridae fauna as follows: Endemic species are also the most dominant components, the next are Palearctic species, Widely-distributed species , Holarctic species and Oriental species. There is the richest trichogrammatids and mymarids in Jungar basin, and the fauna component is very complex; being the almost close basin, Tarim basin species are fewer, the fauna component is simpler; the species in Eastern basins are more than that in Tarim basin and the fauna component is between Jungar' s and Tarim basin' s; there are fewer species on Tianshan mountain, mainly because of the inadequate collecting.In the third part, the 16 genera of Trichogrammatidae and 16 genera of Mymaridae from Xinjiang are diagnosed and keyed for both sexes. In each genus the following information is given : 1)generic synonymy ; 2) geographic distribution; 3)diagnosis; 4)the historical review and the present species; 5)hosts; 6)species known from China. When the genus is detailed studied, a key to the included species from Xinjiang (if species more than 2) and full description of each species is proposed, all the species illustrated in detail. In addition, an illustrated overview of the morphology of the 2 families ispresented to acquaint readers with basic structures.A list of the genera and the number of species under each genus treated in this paper are as follows. Those marked with an asterick are new records for China.I Trichogrammatidae1. *Paratrichogramma Girault, Isp. (new species)2. Trichogramma Westwood, 5 spp.3. Megaphragma Timberlake, Isp. (unnamed)4. Epoligosita Girault, 3 spp. (2 new species, 1 new record )5. Lathromeris Foerster, 1 sp. (undescribed)6. Aphelinoidea Girault, 3 spp. (1 new species, 2 new records)7. Tumidiclava Girault, 1 sp. (new record)8. Zagella Girault, 1 sp. (new species)9. Hayatia Viggiani, 1 sp. (new species)10. Oligosita Walker, 14 spp. (5 new species, 1 new record)11. Chaetostricha Walker, 1 sp.12. Paracentrobia Howard, 3 spp. (2 new species, 1 new record)13. Densufens Lin, 1 sp. (new species)14. Mirufens Girault, 1 sp.15. Ufens Girault, 1 sp. (new species)16. *Ufensia Girault, 1 sp. (new species)*II Mymaridae1. Alaptus Westwood, 2 spp. (new records)2. Dicopus Enock, 1 sp. (unnamed)3. Arescon Walker, 2 spp. (1 new species, 1 unnamed)4. Camptoptera Foerster, 4 spp. (3 new species, 1 new record)5. *Stephanocanipta Mathot, 1 sp. (new species)6. Ooctonus Maliday, 3 spp. (1 new species, 1 new record, 1 unnamed)7. Gonatocerus Nees, 16 spp. (8 new species, 2 new records)8. Anagrus Haliday, 9 spp. (3 new species, 4 new records)9. Stethynium Enock, 1 sp. (new record)10. Anaphes Haliday, 6 spp. (2 new species, 4 new records)11. Erythmelus Enock, 4 spp. (2 new species, 2...
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