Antennal hygroreceptors of the honey bee,Apis melliferaL., have been investigated electrophysiologically and the sensillum containing these receptors with SEM. Moist and dry hygroreceptors have been identified along with a thermal receptor in a specialized coeloconic sensillum. This sensillum comprises a cuticular, shallow depression (diameter; 4 μ) having a central opening (1.4–1.5 μm) and a mushroom-shaped protrusion (1.4–1.5 μm) from the opening. The head of the protrusion is irregular in shape and is not perforated. This sensillum has been thus far referred to as a “sensillum campaniformium” (Dietz and Humphreys 1971), henceforth, it is referred to as a coelocapitular
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