246 Experiments on colour relation. 



Explanation of Plate XL 



Fig. 1. — Greeu larva of B. cratcvgata, last stage, nat. size. 



Fig. 2. — Brown larva of E. cratcvgata, last stage, nat. size, 

 resting on black stick. 



Fig. 3. — Larva of R. cratccgata (brown form), in spiral attitude, 

 resting on stick, x 4 diameters. 



Fig. 4. — Larva of C. nupta (dark sixrromi dings), nat. size, fifth 

 stage. 



Fig. 5. — Larva of G. nupta (green surroimdings), nat. size, fifth 

 stage. (The first abdominal segment has been inadvertently 

 omitted). 



Fig. 6. — Larva of G, fraxini (dark smTomidings), nat. size, last 

 stage, resting on black stick. 



Fig. 7. — Larva of G. fraxini (green surroundings), nat. size, last 

 stage. (This larva was only placed on a stick for convenience of 

 drawing) . 



Fig. 8. — Larva of S. tilice, nat. size, last stage. 



Fig. 9. — Fifth and sixth abdominal segments of larva of S. tilicB, 

 fourth stage, immediately after ecdysis, showing first appearance 

 of spiracular spots, x 4 diameters. 



Fig. 10. — Fourth and fifth abdominal segments of larva of S. 

 tilice, fifth stage, showing first appearance of upper row of spots, 

 X 4 diameters. 



Fig. 11. — Fifth and sixth abdominal segments of larva of S. 

 popiili, fourth stage, x 4 diameters. 



Fig. 12. — Fifth and sixth abdominal segments of larva of S. 

 looindi, fourth stage, shortly before last ecdysis, x 4 diameters. 



Fig. 13. — Same segments, fifth stage, after last ecdysis, x 4 dia- 

 meters. 



