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question. The second species in the genus is Xenotarsonemus icadeae Cromroy, which was described (Cromroy, 1958) from specimens taken on Centroseema virginiana (Leguminosae) in Puerto Rico. Again the host association may be of little significance in consideration of biological relationships of the species, since apparently only two mites (a male and a female) were collected. Because of the unusual taxonomic position occupied by members of this genus, reflecting the striking morphological modifications of the males, it will be of great interest to learn something of the biological relationships of members of the group. To date, such information has not come to light. This paper describes a third species in the genus Xenotarsonemus. Specimens were taken on old leaves of the host plant that had patches of surface-growing fungi in considerable abundance, suggesting that it is a fungus-feeder. This, however, is to be regarded only as circumstantial |
