Reference work entry
Greek: xenos = foreign, psylla = flea, cheops = Egyptian pharaoh.
Tropical rat flea (described by Rothschildt), vector of the agent of the plague (Yersinia pestis). This flea, which has no ctenidia at the head or notum, reaches a length of 1.5–2 mm and is now found worldwide (Figs. 1 and 2). Other Xenopsylla spp. are X. braziliensis (African rat flea, first described in Brazil, but important in Africa and India) and X. asiatica (syn. X. astia) found in Sri Lanka. General development see Fleas.
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