Inquilines or kleptoparasites? New phlaeothripine Thysanoptera associated with domicile-building thrips on Acacia trees

Five new species of phlaeothripine Thysanoptera are described in three new genera. These thr-ip all live in association with other, as yet undescribed , phlaeothripine species that construct, and breed within, domiciles on the phyllodes of Acacia trees in the arid areas of Australia. The new species all have particularly unusual structures at the anterior end of the body. C respithrips enigmaticus gen. et sp. n. and Crespithrips hesperus sp. n. bot h have the inner margin of antennal segment I produced into a long bifurcat e tooth and the median antennal segments bear an unusual array of supernume rary small sense cones. Crespithrips enigmaticus has been found breeding wi thin domiciles comprising pairs of glued phyllodes. These domiciles were pr oduced on different species of Acacia by two undescribed species of an unde scribed genus related to Dunatothrips Moulton. Schwarzithrips zammit gen. e t sp. n. and Schwarzithrips glyphis sp. n. have the external margin of ante nnal segment Il produced into a narrow blade, but have antennal sensoria ty pical of other phlaeothripines of the Liothrips-lineage. These species have been taken within tent-like domiciles that an woven on the flat phyllodes of Acacia catenulata and a related species, by two undescribed species of D unatothrips. The species pairs in these two new genera have vicariant distr ibutions between central and western Australia. Vicinothrips bullatus gen. et sp. n. is based on a single unusual specimen from Queensland with antenn al segment II uniquely swollen and rounded.