The rate of oxygen consumption of mature larvae of Anagasta kühniella (Zell.) exhibits a logarithmic relationship to temperature over a range extending from the limit of supercooling to the beginning of heat injury. This information supplements that of Scholander et al. (4), who demonstrated the same relationship in frozen Chironomus larvae, the rate being lower than in supercooled forms and hence not continuous with the above-zero portion of the curve. Together, these two simple relationships invalidate Kozhantschikov's theory of cold-hardiness based on a thermostable respiration below 0 °C. in cold-hardy insects and no respiration in frozen non-cold-hardy insects.