The development of the Oriental latrine fly, Chrysomya megacephala (Fabricius), was examined at 27℃ in order to resolve discrepancies in previous reports. Various developmental events were completed by all larvae by the following ages : egg hatch, 18hr; first molt, 30hr; second molt, 72hr; pupariation, 144hr; adult emergence, 234hr. Differing descriptions of C. megacephala development appear to reflect variation in the length of the postfeeding period, during which time larvae may be particularly sensitive to environmental conditions. By sampling entire age cohorts, we were able to construct confidence bands about growth curves based on body length and dry weight. This allows the first measure of precision for estimates of larval age based on laboratory growth data.