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Presented, with comments, are 131 plates of illustrations of geometrid eggs representing five subfamilies of the Geometridae: one species of Oenochrominae, 72 species of Ennominae, four species of Geometrinae, nine species of Sterrhinae, and 45 species of Larentiinae. The illustrations are useful as identification aids, in demonstrating relationships between species, and in assessing the validity of species groupings based on taxonomic criteria from other life stages.

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The eggs of 18 species of cutworms of the subgenus Euxoa Hübner are described and a key for separating some of them has been constructed. Only in rare instances can species be identified from egg morphology alone, but the egg stage can usually be identified to the subgeneric level.

Can. Ent. 105: 1091-1099 (1973) The four larval instars and the pupa of Ptychoptera lenis lenis Osten Sacken are described. Instars 2 to 4 are very similar morphologically but instar 1 is markedly different. Both a pharate pupal and a pharate adult stage were observed. Larvae are found in stagnant marginal areas of ponds where water depth does not exceed 4 cm and where benthic deposits of plant detritus exceed 8 cm. Fourth instar larvae, under experimental conditions, survived up to 45 days without contact with atmospheric oxygen but development was arrested. P. lenis has a 1 year life cycle with an extended adult emergence season from late May to the end of July.