We have observed thermoluminescent emission from the irradiated exoskeletons of cicada (Magicicada sp.). At a heating rate of approximately 600C/min, the peak light emission temperature was 183±30C. This effect corresponds to charge-carrier trap parameters of Ealfa=0.82±0.04eV and wo=109.1±0.5 sec−1. Response to filtered y radiation of 50-kV peak energy was on the order of 3.2 × 106 photons/R/g. Insect exoskeletons are thus potentially useful as dosimeters.