Fig. 1. Stage I.; a caterpillar immediately after hatching. Natural length, 0.2 centim. Fig. 2. Stage II.; shortly after the first moult. Natural length, 0.7 centim. Figs. 3-12. Stage V.; the chief colour-varieties. Fig. 3. The only lilac-coloured specimen in the whole brood. Natural length, 3.8 centim. Fig. 4. Light-green form (rare) with subdorsal shading off beneath. Fig. 5. Green form (rare) with strongly-pronounced dark markings (dorsal and subdorsal lines). Natural length, 4.9 centim. Fig. 6. Dark-brown form (common). Natural length, 4 centim. In this figure the fine shagreening of the skin is indicated by white dots; in the other figures these are partially or entirely omitted, being represented only in Figs. 8 and 10. Fig. 7. Light-green form (common). Natural length, 4 centim. Fig. 8. Light-brown form (common). Natural length, 3.5 centim. [Illustration: Plate III. Aug. Weismann pinx. Lith. J.A. Hofmann, Würzburg. ] [Illustration: Plate IV. Aug. Weismann pinx. Lith. J.A. Hofmann, Würzburg. ] [Illustration: Plate V. Aug. Weismann pinx. Lith. J.A. Hofmann, Würzburg. ] [Illustration: Plate VI. Aug. Weismann pinx. Lith. J.A. Hofmann, Würzburg. ] Fig. 9. Parti-coloured specimen, the only one out of the whole brood. Natural length, 5.5 centim. Fig. 10. Grey-brown form (rare). Fig. 11. One of the forms intermediate between the dark-brown and green varieties, dorsal aspect. Fig. 12. Light-green form with very feeble dorsal line (shown too strongly in the figure), dorsal aspect. Figs. 13-15. _Deilephila Vespertilio._ Fig. 13. Stage III.(?); the subdorsal bearing yellow spots. Natural length, 1.5 centim. Fig. 14. Stage IV.; the subdorsal interrupted throughout by complete ring-spots, the white “mirrors” of which are bordered with black, and contain in their centres a reddish nucleus. Natural length, 3 centim. Fig. 15. Stage V.; shortly after the fourth moult. Subdorsal line completely vanished; ring-spots somewhat irregular, with broad black borders; natural length, 3.5 centim. Fig. 16. _Sphinx Convolvuli_, Stage V., brown form. Subdorsal line retained on segments 1-3, on the other segments present only in small remnants; at the points where the (imaginary) subdorsal crosses the oblique stripes there are large bright spots; natural length, 7.8 centim. PLATE IV. Figs. 17-22. Development of the markings in _Chærocampa Elpenor_. Fig. 17. Stage I.; larva one day after hatching. Natural length, 7.5 millim. Fig. 18. Stage II.; larva after first moult. Length, 9 millim. Fig. 19. Stage II.; immediately before the second moult (Fig. 30 belongs here). Length, 13 millim. Fig. 20. Stage III.; after second moult. Length, 20 millim. Fig. 21. Stage IV.; after third moult (Figs. 32 and 33 belong here). Length, 4 centim.