Abstract
THE coloration, rate of development and behaviour of the larvae of the armyworm, Leucania separata Walker, differ when the larvae are subjected to different degrees of crowding during development. Active black larvae appear in crowded conditions and develop more rapidly, feed more voraciously, and tolerate starvation and less palatable food-plants better than the sluggish pale larvae that appear in uncrowded conditions. This phenomenon has much in common with phase polymorphism in locusts1.
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