Abstract: This paper reports on the autogeny occurring in Phlebotomus chinensis.During the field surveys on the bionomics of P.chinensis in Yi Chuan county,Shanxi province in 1979,it was often found a considerable number of adult females of this fly with fully developed fat bodies upon dissection,4 out of a total of 301 specimens appeared to be autogenie because their ovaries had developed under the conditions of having no blood in their guts but plenty of granules in their accessory glands.According to our laboratory examinations,the newly emerged male and female copulated when they were put together in a small container.Among 4 unfed female sandflies,one laid fertile eggs and the larvae hatched out after 10 days,while the others showed that their ovaries contained mature or nearly mature eggs and their accessory glands were full of granules.In short,the result indicates that the phenomenon of autogeny does exist in the population of P.chinensis.