Abstract
1. 1. The function of the facial pits in oriental Crotalines of the genera Trimeresurus and Agkistrodon was examined by electro-physiological recording from the nerves of the pit membrane. Functional response to pure infrared stimuli was demonstrated, confirming the results obtained from New World Crotalines by earlier workers. 2. 2. Response was tonic in the case of “normal” stimuli and phasic in the case of “painful” stimuli. 3. 3. Golay detector functioning of the pit organ was excluded, and the pit membrane was shown to lack any special absorption powers in the infrared spectrum. Control experiments on the analogous nerves of Colubrid snakes produced negative results. 4. 4. The pits function equally well at any temperature in the range at which the snakes are active.
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