In this study, two new tetrablemmid species are described from both sexes, Ablemma unicornis sp. n. from Malaysia and Tetrablemma magister sp. n. from Australia. Males of A. unicornis sp. n. are distinguished from all other Ablemma species by the position of a tooth on the carapace behind the eye group and by the shape of the palpal bulb. Females of A. unicornis sp. n. are distinguished from most other Ablemma species by the profile of the carapace in lateral view and by the narrow eye field in proportion to the carapace width. Males of T. magister sp. n. are distinguished from most other Tetrablemma species by the shape of the palpal bulb and females by the rounded profile of the carapace in lateral view. Aspects of the sex-linked characters in both species and leg modifications in the male of A. unicornis sp. n. are discussed.