A new genus, three new species, and three known species of oribatid mite are described firom the marine littoral of the Ryukyu Arehipelago, southwestern Japan. These taxa are Arotrobates granutatus Luxton, 1992, Rhizophobates shimojanai gen. nov. and sp. nov., Schusteria nagisa sp. nov,, S. saxea sp. nov., Atismobates reticutatus Luxton, 1992, and Fortaynia rotunda Marshall and Pugh, 2oo2. Two Afirican species of thc genus Schusteria, S.
The presence of an alarm pheromone was demonstrated in the deutonymphal stage of the oribatid mite, Nothruspalustris (C. L. Koch). The active principle was identified as 3,7-dimethyl-(E)-2,6-octadienal, geranial, and was shown to be active at doses of 10-100 ng. This is the first such pheromone identified in oribatid mites.
Five species of the family Euphthiracaridae are described. They include two new species, Euphthiracarus foveolatus and E, takahashii. Micro tritia minima (BERI.EsE) is newly recorded from Japan. As the members of the family Euphthiracaridae only two species were identified in our country. One of them is the most common species, Rhysotritia ardua (C. L. KOCH), and the other is Microtritia tropica MARKEL which was known in Japan by a single specimen collected at Kakeroma Island. Another species of the genus Microtritia has been known from various parts of Japan. It was ascertained that this species was quite identical with the European species, M. minima (BERLEsE), and its redescription was given here based on the Japanese material. None of the species of the genus Euphthiracarus was reported from Japan, but two species of the genus were newly found from Oki Island and Miyake Island, respectively. These are both new species and described in the present paper.
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