Notes on scale insects of Aulacaspis associated with mangroves and cycads (Sternorrhyncha: Coccoidea: Diaspididae).

Six species of the scale insect genus Aulacaspis are dealt with, five of them occurring on mangroves and one on cycads, unusual host plants for members of the genus. A. australis is revised on the basis of specimens collected on Bruguiera at Cairns, Australia, and its close relationship with the Papuan A. martini is discussed. A. crawii is newly recorded from Xylocarpus in Malaya. A. tubercularis is recorded from Rhizophora, Bruguiera, and Xylocarpus for the first time, and from Malaya, Borneo, and Palawan, and its variation in the shape of the median trullae is shown to be remarkable in specimens collected from the leaves and branches of Bruguiera and Xylocarpus. A. pallida, a species known to occur on Litsea in Luzón, is recorded from Xylocarpus on the basis of a single specimen, which is compared with samples collected at four localities of Luzón on Litsea. A. marina, a serious pest of Rhizophora seedlings in Bali and known also from Palawan and Malaya, is newly recorded from Java and Sulawesi and from Xylocarpus in Bali. A. yasumatsui, a devastating pest of cycads recently spread in the tropics and subtropics of the world, is examined for its variation on the basis of samples from some localities. In Addendum, Duplachionaspis oblonga and D. yunnanensis are transferred to Aulacaspis, and the specific name A. malayala is invalidated.