A microcomputer-based flight mill system for Colorado potato beetles, Leptinotarsa decemlineata (Say), is described. The system provides detailed information on flight duration, speed, and frequency of individual flights, according to user-alterable specifications. In an experiment using summer-generation female beetles, flight parameters were similar among beetles fed on potato or Solatium dulcamara , whereas starved beetles virtually did not fly. Speeds for beetles on the flight mill are significantly slower than those observed in the field.