This paper describes two new species Hypoaspis ( Cosmolaelaps ) helanshanensis sp . nov . and Hypoaspis (Cosmolaelaps) liujingyuani sp. nov., in the genus Hypoaspis Canestrini, 1885. All specimens were collected from Helan Mountain Nature Reserve of Ningxia Hui Autonomous Region, China, from nest of Myrmos spp.. The type specimens are deposited in the Collection of the Medical Entomology of Institute of Microbiology and Epidemiology Academy of Military Medical Science, Beijing, China and Ningxia Hui Autonomous Region Center for Disease Control and Prevention, Yinchuan, Ningxia, China. The genus Hypoaspis was erected by Canestrini in 1885, belongs to Laelapidae Berlese, Karg(1979) divided Hypoaspis into eight subgenera: Hypoaspis Canestrini, Hypohasta Karg, Cosmolaelaps Berlese, Alloparasitus Berlese, Geolaelaps Tragardh, Pneumolaelaps Berlese, Holostaspis Kolenati and Laelaspis Berlese; while Evans & Till(1979) promoted these subgenera(Cosmolaelaps, Holostaspis, Pneumolaelaps, and Laelaspis) to genera. This paper follws Kart(1979). Up to now, Hypoaspis has a total of more than 170 known species worldwide, and more than 60 species(subspecies) of them have been reported from China(Teng, 1993;Bai et al. 1993;1994;1995;2002;2012;Bei et al. 2003;Gu et al. 1990;1991;1992;Liu, et al. 1996;Ma et al. 1996;1997;1998;2000;2003;2004;2009;2010;Xu et al. 1996). Two new species of Hypoaspis were collected from Helan Mountain Nature Reserve of Ningxia Hui Autonomous Region, China, from nest of Myrmos spp. in this paper. Terminology used for the dorsal idiosomal chaetotaxy follows Kart (1979), the measurements are given inμm.%描述宁夏下盾螨属Hypoaspis Canestrini,1885的2新种，即贺兰山下盾螨，新种Hypoaspis(Cosmo-laelaps) helanshanensis sp. nov.和刘氏下盾螨，新种Hypoaspis(Cosmolaelaps) liujingyuani sp. nov.，标本采自宁夏贺兰山自然保护区的蚂蚁Myrmos sp.巢穴中，保存于军事医学科学院微生物流行病研究所医学昆虫标本馆和宁夏回族自治区疾病预防控制中心。
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