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Published online by Cambridge University Press: 31 May 2012
Antepenultimate Instar. Head width 1.4 mm. Body about 13 mm. long and 2 mm. wide. Crochets on first abdominal proleg number 14 to 16.
Penultimate Instar. Head width 1.7 to 2.0 mm. Body from 15 to 17 mm. long and about 2.5 mm. wide; ground colour medium to dark green, the moderately broad white dorsal line separated from the slightly broader white subdorsal lines by twice its width in ground colour; white patches, more conspicuous in anterior segments, immediately distad of each seta alpha; spiracular line dark green, subspiracular line white with a fringe of yellow.
* Contribution No. 2118 from the Division of Entomology, Science Service, Department of Agriculture, Ottawa. This is the second of a series of contributions from the Canadian Forest Insect Survey.