The Larvae ofChoristoneura fumiferana(Clem.) andC.pinusFree. (Lepidoptera: Tortricidae)

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Abstract
It has long been known that a series of late-instar larvae ofChoristoneura fumiferana(Clem.) may be distinguished from one ofC. pinusFree. by colour differences of the head and prothoracic shield: specimens of the former usually have dark heads and light prothoracic shields; specimens of the latter usually have light heads and dark prothoracic shields. However, intensive study of the larvae, including numerous specimens ofC. fumiferanafrom the spruce-balsam fir areas of Algonquin Park, Ontario, and ofC. pinusfrom jack-pine areas at Normandale, Ontario, has shown that there are highly significant structural differences in the head; these differences serve to identify small series of either species and most single specimens.
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