When Melanophila acuminata De Geer was stimulated with infrared radiation, responses were obtained in the range of from 2.0 to 6.0@m. The highest sensitivity was found to be, however, in the 2.5 to 4.0@m range at an energy level of 6.0 x 10 @ o 5 watts per cm 2 . The organs which detect infrared radiation are found on the mesothorax adjacent to the coxal cavities. Through consideration of the physical characteristics of infrared radiation it has been possible to estimate the distances from which forest fires of various sizes could be detected by M. acuminata. For instance, the radiation from a 50 acre fire in mountainous terrain could be detected by this insect from 5 km away but the same size fire on flat land could only be detected from 1 km. The ecological implications of the habits of this insect are also discussed.
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William G. Evans (1966) studied this question.