Two monotypic and troglobitic genera of harvestmen are described from caves in Oaxaca, Mexico: The Karosinae Cruz-López & Francke, 2017 Brujita chapulapa n. gen., n. sp. and the Stygnopsinae Sørensen, 1932 Toojah cimutaa n. gen., n. sp., both based on males only. Also, based on the examination of the male holotype of Hoplobunus planus Goodnight & Goodnight, 1973, the new combination is proposed: Mictlana plana (Goodnight & Goodnight, 1973) n. comb., proposing an emended diagnosis for Mictlana Cruz-López & Francke, 2015, including an analysis of the dilemma of the position of the ocularium and observations on selected homoplastic characters. Finally, on the regard of troglobitic stygnopsids, a review of the exclusive morphological traits exhibit by some representatives of the family is addressed, discussing on the putative synapomorphies of each subfamily.