Abstract
Two new species belonging to the genus Eutetranychus Banks (Acarina : Tetranychidae) and living on cultivated plants in Madagascar, are described-and compared with E. orientalis from Israël. In Madagascar, both species occur on the same host plants ie. Citrus, Artocarpus, Plumeria, but E, eliei is rather confined to the South West of the island while E, sambiranensis is found in the North-West. The number of chromosomes of the three species appear to be different. Interspecific matings show a reproductive isolation, although females of E. eliei are positively attractive to the males of the other two species.
