The diagnosis of the genus Lasioseius is given in this paper. A new species, L. scrotiformis sp. nov. Jiang &Jin, is described and illustrated, collected from Guizhou Province, China. The new species is similar to L. yadongensis Ma & Wang but can be easily separated by the following characters: Anterior podonotal shield colliculate-reticulate, 10 pairs of setae in soft cuticle laterad shield, without presternal plate, on both sides of genital plate with 1 pore;while in L. yadongensis Ma &Wang, Anterior podonotal shield fish scale-shaped, without seta in soft cuticle laterad shield, with 2 pairs of presternal plates, on both sides of genital plate without pore. The type specimen is deposited in Institute of Entomology, Guizhou University, P. R. China ( GUGC) . An updated key is given to 25 species of the genus known in China at present.%本文记述毛绥螨属Lasioseius一新种囊毛绥螨Lasioseius scrotiformis Jiang &Jin, sp. nov.,近似种为亚东毛绥螨Lasioseius yadongensis Ma &Wang,二者区别在于新种背板前部具囊泡状网纹,背表皮毛10对均为刀状,无胸前板,生殖板两侧具孔缘1对；而亚东毛绥螨背板前部无囊泡状网纹,无背表皮毛,具2对胸前板,生殖板两侧无孔缘。模式标本保存于贵州大学昆虫研究所( GUGC)。文中编制了含本文记述新种在内的中国已知25种的分类检索表。
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