Three extraordinary new species of Psocoptera (Insecta) from Colombia, Malaysia and Thailand (Epipsocidae, Lachesillidae, Ectopsocidae). -The following species are described and illustrated: Odontopsocus compactus sp. n. (Colombia), Lachesilla hirsuta sp. n. (Thailand), Ectopsocus venosus sp. n. (East Malaysia: Sabah). Each of them is characterized by a morphological structure which is unusual within the genus concerned and, in the case of Odontopsocus compactus, unique within the order

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... ra. The presence of a cup-like, unsegmented and heavily sclerotized abdominal carapace in this species is discussed in the light of its mode of life in humid moss and litter and is compared with similar convergent structures in other psocids.