Simultaneous intracellular recordings were made from the six dorsal longitudinal flight muscle (DLM) fibers in the temperature‐sensitive mutant of Drosophila melanogaster, shibirets 1 (shi). The DLM firing pattern induced by temperature in shi was compared with the DLM pattern of a wild‐type fly in stationary flight. The firing pattern, induced at temperatures between about 26 and 27°C, was very similar to that of the wild‐type pattern. At higher temperatures, the pattern became abnormal, characterzed by many synchronous firings among the fibers and occasional bursting.