Color morphs of sphingid caterpillars that feed on the plant family Vitaceae 2-1. Fourth instar brood frequency for 35 wild-collected Amphion floridensis females 2-2. Estimation of wi thin-family and be tween-family components of the total variance in brood frequencies (% pink) of Amphion floridensis 2-3. Effect of female collection site and week of collection on offspring brood frequency {% pink). ANCOVA on the arcsine transformed data 2-4. Changes in egg weight of Amphion floridensis... 2-5. Differences in larval color frequencies between early and late clutches from 13 female Amphion 2-6. Offspring brood frequencies {% pink in fourth instar) of inbred crosses of Amphion floridensis 2-7. Offspring brood frequencies {% pink in fourth instar) of outbred crosses of Amphion floridensis 2-8. Mean percent pink of parents and offspring broods for four types of crosses 2-9. Effect of midparent brood frequency and parental color on offspring brood frequency {% pink). ANCOVA on the arcsine transformed data from outbred crosses 2-10. Effect of midparent brood frequency and parental color on offspring brood frequency (% pink). ANCOVA on the arcsine transformed data from inbred crosses 68 vii 2-11. First experiment on effect of temperature and daylength on brood frequencies in fourth instar Amphion larvae.... 2-12. ANOVA of effect of temperature and daylength on brood frequencies in Amphion floridensis (first experiment)... 2-13. Second experiment on effect of temperature and daylength on brood frequencies in fourth instar Amphion larvae.... 71 2-14. ANOVA of effect of temperature and photoperiod on morph frequencies (second experiment-balanced, factorial design, without replication) 2-15. Effect of rearing density during the second through fourth instar on fourth instar morph frequency in Amphion 2-16. "Density" effect is really due to differences in humidity and/or food desiccation 3-1. Reported correlations between foodplant variation and sphingid caterpillar morphs 3-2. Relative frequency of different morphs of Smerinthus ocellata and Laothoe populi final instar larvae found on five species of willow 3-3. Field observations of eggs and larvae of Eumorpha fascia ta in north Florida, 1985-1988 3-4* Eumorpha fasciata field censuses tabulated by foodplant species and year 138 3-5. Pupal weights of Eumorpha fasciata reared on three species of Ludwigia 139 3-6. Pupal weights of green versus black Eumorph fasciata reared on Ludwigia peruviana 140 3-7. Median dates for finding green and black (or yellow) fifth instar Eumorpha fasciata larvae in the wild 3-8. Median dates for finding green and pink or yellow fourth instar Eumorpha fasciata larvae in the wild. ............ 142 3-9. Fourth-instar color ratios of Amphion floridensis larvae reared in the lab on three foodplant species 143 3-10. Pupal weights of Amphion floridensis reared on three species of Vitaceae 144 viii 3-11. Brood frequencies of fourth instar Amp hi on larvae when reared in the lab on two forms of Ampelopsis leaves 3-12. Average color scores of Ampelopsis and ...