Abstract
There is much variation in the extent of tracheation of the wings of adult Lepidoptera. This is surveyed. Significantly more tracheal branching is found in species with pupal cocoons. No correlation of tracheation with wing length is apparent. The concentrations of oxygen and carbon dioxide in the air inside cocoons of Antheraea pernyi Guér. (Saturniidae) before emergence are measured. Oxygen supply is probably not limited by the cocoon. Respiration rates per unit mass of wings of A. pernyi are similar to those of the whole, resting adult. The possible adaptive significance of this tracheation and its variation is discussed.
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