One dialect of Yi spoken in Meigu County in the southern part of China's Sichuan Province is analyzed for its tone patterns, based on data provided by a bilingual native speaker. Consonant and vowel inventories are provided. Three contrastive tones are found. One has three allophones, which are conditioned by the preceding tone. Tonal allophony is illustrated in one data set. Some tonal allomorphy is also found; in a second data set, a rule applying to nominal compounds and affecting the tone of the first noun root is illustrated. A third data set illustrates another rule that applies in number + classifier compounds and affects the tone of the classifier. (MSE)