The results vary according to the species.. The little Scarites lúvigatus, although closely related to the former species, remained motionless only a few minutes. The big buprestid Capnodis tenebrionis sometimes presented an equally brief reaction, but sometimes remained motionless for an hour. This last insect is very sensitive to variations in temperature; in the sun it resumes its activity quickly, while under the action of cold it may simulate daath for nearly five hours. Quite contrary to the giant Scarites, it loves the warmth and delights in the light. Buprestis rutilans, which has similar habits, rebels at experimentation. Each species has its own manner, and nothing can guide us in researches of this kind.