Chigger mites of the genus Leptotrombidium: key to species and their distribution in China.

Chigger mites of the genus Leptotrombidium (Acari: Trombiculidae) transmit scrub typhus, caused by Rickettsia tsutsugamushi (= R.orientalis) in South-East Asia. In China, eighty-two species of Leptotrombidium have been recorded; these are listed with the names of Provinces where they were found. Five species, L.deliense, L.insularae, L.kaohuense, L.rubellum and L.scutellare, have been implicated as Chinese vectors of scrub typhus. A brief key is given to the larvae of all but three of the Leptotrombidium mites known in China.