Post-embryonic development of Megalolaelaps colossus sp. nov., is described and illustrated. This unusually large species of mite is closely associated with the dung beetle Oxysternon conspicillatum (Weber) (Coleoptera: Scarabaeidae) in Colombia. All instars of the mite occur on the beetle, except for the larva. This is the first description of all instars for a species in this genus.

A species of laelapid mite,Ololaelapsformidabilis, is redescribed based on male and female adults from soil in Sumatra, Indonesia. This species is distinguished from otherOlolaelapsspecies by its metapodal platelet narrowly fused with the parapodal plate and by its hologastric shield having two inverted-V-like ridges. The genus is redescribed based on a review of the literature and examination of specimens of some species. Valid species ofOlolaelapsare listed and accompanied by notes on morphological characters to assist future revision of the genus.

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A new species of blattisociid mites Lasioseius orangrimbae n. sp., that belongs to the floridensis-group, is described based on females and males from litter and soil samples of secondary rainforest in Sumatra, Indonesia.

Herein, we update the diagnosis and description of the genus Krantzolaspina Datta & Bhattacharjee and provide a list of the three valid species including new combinations and synonyms, as follows: 1) Krantzolaspina angustatus (Ishikawa, 1987) comb. nov. (= Indutolaelaps jiroftensisHajizadeh et al., 2017syn. nov.), 2) K. rebatii Datta & Bhattacharjee, 1989 and 3) K. solimani (Metwali, 1983) comb. nov. Finally, we re-describe K. angustatus (Ishikawa, 1987) comb. nov. based on the holotype from Japan, voucher specimens from Iran and additional females that we found in soil samples from oil palm plantations in Sumatra, Indonesia.