. The Canadian field-naturalist. 254 The Canadian Field-Naturalist Vol. 100. Figure 1. Female Hornet Moth, Sesia apiformis (Clerck), collected at St. John's, Newfoundland, 1983-07-25; times natural size. (Photograph by B. G. Penney.) length of the largest larvae examined as 30-50 mm, and indicated that the dorsal surface of the head was strongly convex (in lateral view) and comparatively smooth. Headfrontal sutures were strongly curved inward between Adf and AdP so that the adfrontals were distinctly narrower in this area than elsewhere, even in young instars. The spiracles were usually ci
. The Canadian field-naturalist. 254 The Canadian Field-Naturalist Vol. 100. Figure 1. Female Hornet Moth, Sesia apiformis (Clerck), collected at St. John's, Newfoundland, 1983-07-25; times natural size. (Photograph by B. G. Penney.) length of the largest larvae examined as 30-50 mm, and indicated that the dorsal surface of the head was strongly convex (in lateral view) and comparatively smooth. Headfrontal sutures were strongly curved inward between Adf and AdP so that the adfrontals were distinctly narrower in this area than elsewhere, even in young instars. The spiracles were usually circular in early instars, but oval in later instars. Acknowledgments The assistance of J. E. H. Martin, Biosystematics Research Institute, Ottawa, in providing references, and T. D. Eichlin, Food & Agriculture, State of California, Sacramento, California, in confirming the identity of the species is acknowledged. Literature Cited Engelhardt, G. P. 1946. The North American clear-wing moths of the family Aegeriidae. United States National Museum Bulletin 190. 220 pp. Forbes, W. T. 1923. Lepidoptera of New York and neigh- boring states. Memoir of the Cornell University Agricul- tural Experimental Station 68. 729 pp. MacKay, M. R. 1958. The North American Aegeriidae (Lepidoptera): A revision based on late-instar larvae. Memoirs of the Entomological Society of Canada 58. 112 pp. South, R. 1961. The moths of the British Isles. The Wayside & Woodland Series. Frederick Warne & Co. Ltd. London & New York. Series 1. 427 Series 2. 379 pp. Received 1 October 1984 Accepted 3 January 1985. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Ottawa Field-Naturalists' Club. Ottawa, Ottawa Field-Naturalists' Club
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