Description of four new species of armoured spiders (Araneae, Tetrablemmidae) from Sumatra, Indonesia

Four new species of armoured spiders from Sumatra, Indonesia are described. Three species are described in the genus Ablemma Roewer, 1963 and one species in the genus Brignoliella Shear, 1978; Ablemma andriana sp. n. (male), Ablemma contrita sp. n. (male and female), Ablemma kelinci sp. n. (male) and Brignoliella patmae sp. n. (male and female). The female of Ablemma singalang Lehtinen, 1981 is described here for the first time. The first record of Brignoliella for Sumatra is also presented.