In 1975, the survey on the medically important fiies was made in the different geographical parts of Thailand. Since that time, all the fly specimens have been examined and identified. Most of them have reported as series under the same title (Tumrasvin et at., 1976-1979). rn this paper we are reporting three subfamilies, Phaoniinae, Lispinae and Fanniinae respectively. Phylogenetic systems identifying subfamilies and genera in this paper cited Emden's system (Ernden, 1965) in connection ",ith former paper on Muscidae (Tumrasvin and Shinonaga, 1978). Subfamily Phaoniinae Key to Tribes of Phaoniinae 1, Pteropleura hairy on upper part; metathoracic spiracles with black bristles along lower margin ,,.....,. Dichaetomyiini * litsl'llt'ii,'',k utacpt\blfirt, iff'sF-\pmcafi (fk fi#: 1ll mb rt e5> Oec tz C: k Li Tt h ftL t: .

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