Development time, head capsule diameter, pupal weight, and mortality were measured for the mimosa webworm,Homadaula anisocentraMeyrick, under five constant-temperature regimes. The data were subjected to traditional linear regression techniques as well as to computer-assisted modeling procedures. Minimum development thresholds for the immature life stages fell within a range of 8.5–13.0°C. Approximately 70, 280, and 135 degree-days above a 12.3°C threshold were required to complete egg, larval, and pupal development, respectively.