Species of the genus Mastrus Foerster (Hymenoptera, Ichneumonidae) of China with descriptions of two new species parasitizing sawflies (Hymenoptera) Author Sheng, Mao-Ling Author Zeng, Xiang-Fu text ZooKeys 2010 57 63 73 http://dx.doi.org/10.3897/zookeys.57.421 journal article http://dx.doi.org/10.3897/zookeys.57.421 1313-2970-57-63 Mastrus deminuens (Hartig, 1838) Specimens examined. 1 female, CHINA: Dongfeng, Jilin Province, 15 May 2004, Mao-Ling Sheng. Host. Pachynematus itoi Okutani ( Hymenoptera : Tenthredinidae ). Host plant. Larix gmelinii (Rupr.) Rupr. ( Pinaceae ). Distribution. China (Jilin), Russia, Europe ( Yu et al. 2005 ).