Abstract
The karyotypes of the two main scrub typhus vectors, Leptotrombidium akamushi (Brumpt) and L. scutellare (Nagayo, Miyagawa, Tamiya and Tenjin), in Japan were studied in order to determine the sex mechanism. The mite tritonymph was found the most suitable stage for the chromosome preparations. At this stage, mitotic cell divisions were found among the spermatogenetic cells in the male, while only mitotic cells were found in the female. Their karyotypes were 2n = 12+XY in L. akamushi and 2n = 14+XY in L. scutellare, respectively.
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