The ultor-group of the genus Dolichogenidea Viereck (Hymenoptera, Braconidae, Microgastrinae) from China with the descriptions of thirty-nine new species.

The ultor-group of the genus Dolichogenidea Viereck from China is revised, which totally 67 species are recorded. Thirty-nine new species are described and illustrated, i.e., D. alophogaster Liu Chen, sp. nov.; D. altithoracica Liu Chen, sp. nov.; D. anterocava Liu Chen, sp. nov.; D. apicurvus Liu Chen, sp. nov.; D. atarsi Liu Chen, sp. nov.; D. breviattenuata Liu Chen, sp. nov.; D. carborugosa Liu Chen, sp. nov.; D. clausa Liu Chen, sp. nov.; D. conpuncta Liu Chen, sp. nov.; D. crassa Liu Chen, sp. nov.; D. cucurbita Liu Chen, sp. nov.; D. excellentis Liu Chen, sp. nov.; D. flexitergita Liu Chen, sp. nov.; D. fluctisulcus Liu Chen, sp. nov.; D. flexisulcus Liu Chen, sp. nov.; D. gleditsia Liu Chen, sp. nov.; D. hemituba Liu Chen, sp. nov.; D. hexagona Liu Chen, sp. nov.; D. infirmus Liu Chen, sp. nov.; D. latitergita Liu Chen, sp. nov.; D. lincostulata Liu Chen, sp. nov.; D. lobesia Liu Chen, sp. nov.; D. longialba Liu Chen, sp. nov.; D. longimagna Liu Chen, sp. nov.; D. lunatus Liu Chen, sp. nov.; D. medicava Liu Chen, sp. nov.; D. minuscula Liu Chen, sp. nov.; D. multicolor Liu Chen, sp. nov.; D. obsoleta Liu Chen, sp. nov.; D. opacifinis Liu Chen, sp. nov.; D. ovata Liu Chen, sp. nov.; D. parallodorsum Liu Chen, sp. nov.; D. pentgona Liu Chen, sp. nov.; D. punctipila Liu Chen, sp. nov.; D. rectivena Liu Chen, sp. nov.; D. transcarinata Liu Chen, sp. nov.; D. vadosulcus Liu Chen, sp. nov.; D. victoria Liu Chen, sp. nov. and D. wangi Liu Chen, sp. nov. Five new combinations are proposed, i.e., D. acron (Nixon, 1967), comb. nov., D. bambusae (Wilkinson, 1928), comb. nov., D. kurosawai (Watanabe, 1940), comb. nov., D. lissos (Nixon, 1967), comb. nov., D. molestae (Muesebeck, 1933), comb. nov. Four newly recorded species are redescribed and illustrated, i.e., D. acron (Nixon, 1967), rec. nov., D. agilis (Ashmead, 1905), rec. nov., D. bambusae (Wilkinson, 1928), rec. nov., and D. ultima (Kotenko, 1986), rec. nov. One species, D. acutituba Song, Chen Yang, 2006, syn. nov. is synonymized with D. prisca (Nixon, 1967). Fifteen new host are recorded for the following previously described species viz., D. baoris, D. brevicarinata, D. expulse, D. heterusiae, D. hyposidrae, D. kurosawai, D. lacteicolor, and D. prisca and marked by a number sign (#). Eleven new host associations are documented for the following new species: D. alophogaster; D. crassa, D. flexisulcus; D. gleditsia; D. hexagona; D. lincostulata; D. lobesia; D. minuscula; D. multicolor; D. obsolete, and D. rectivena. The hosts of thirty-two species remain unknown. An identification key and distribution maps to the Chinese species of the ultor-group is provided.