. Bulletin. Natural history; Natural history. September 1985 125 Years of Biological Research 145 to be healthy and to have about the same size distribution. On 18-20 June, 49 R. subcordata plants were thorough- ly searched at night for larvae. By searching at night with a strong flash- light, at least 99 percent of the larvae present on a plant were located. By these dates, virtually the entire popu- lation was in the ultimate (Fig. 2) or penultimate instar. A few larvae had already left their host plants to pupate or, if the host was defoliated, to search for more food. No larvae were on 43
. Bulletin. Natural history; Natural history. September 1985 125 Years of Biological Research 145 to be healthy and to have about the same size distribution. On 18-20 June, 49 R. subcordata plants were thorough- ly searched at night for larvae. By searching at night with a strong flash- light, at least 99 percent of the larvae present on a plant were located. By these dates, virtually the entire popu- lation was in the ultimate (Fig. 2) or penultimate instar. A few larvae had already left their host plants to pupate or, if the host was defoliated, to search for more food. No larvae were on 43 per- cent of the plants, and all of these plants showed minor defoliation; how- ever, there was enough defoliation to make it clear that some A. titan cater- pillars had developed to moderate size on these plants before leaving or being preyed upon. The plants (33 percent) with 1-10 larvae had either moderate defoliation (10-50 percent of their leaf. Fig. 2. — (A) Ultimate-instar caterpillar of Aellopos titan; this green morpti tias a white lateral posterior diagonal stripe and light lateral diagonal white and magenta side stripes; it is the most common morph. (B) Ultimate-instar caterpillar of A. titan, this dark morph is dorsally lavender and ventrally black, with white lateral markings. It is the rare morph except during crowding, heavy shading, or total defoliation. The previous two instars of A titan are extremely similar to these caterpillars, 20 June 1983, Santa Rosa National Park, Costa Rica,. 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 Illinois. Natural History Survey Division. Urbana, State of Illinois, Dept. of Registration and Education, Natural History Survey Division
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