the colours of certain Lepidoptera. 



299 



I. Daek Surroundings. Dead 

 leaves, &c., mixed with food-plant. 



II. Green Surroundings. 

 Food-plant only. 



Aug. 21. — A green larva of M. 

 persicarice, 17-5 mm. long, found on 

 marigold, placed same day on same 

 food with brown surroundings, dead 

 leaves, &c. 



Aug. 25. — -Brown paper floor sub- 

 stituted for earth. Larvie still 

 green. Added at this date 3 more 

 green larvii?, measuring 44-3 (when 

 much stretched), 24-25, & 15-0 mm., 

 found on marigold, except the largest 

 larva. 



Aug. 27. — 4 larv;¥ still green, but 

 the largest seemed darker. 



Aug. 28. — 6 more larvte, found on 

 marigold, added, measuring 21-25, 

 19-5, 16-75, 14-25, and 2 of them 

 16-0 mm. 



Aug. 30. — 1 became brown, having 

 changed the last skin, and 25-0 mm. 

 long. The largest was pupating, 

 remaining green (removed) ; 2 were 

 changing their skins, and resting 

 upon a brown and green leaf re- 

 spectively ; removed in order to note 

 effect. Another larva, 19-0 mm. 

 long, added. 



Sept. 1. — Same as Aug. 30, all 

 green but one ; some of the green 

 ones appeared to be darkening ; 4 

 in last stage, 1 of which was eating 

 a small larva of same species, al- 

 though there was plenty of food; 1 

 in last stage but one ; 3 changing 

 last skin, 1 on green, 1 on brown 

 surface ; the other j)laced on a 

 brown surface, and all 3 removed to 

 note effects. 



The 2 removed Aug. 30 had now 

 changed then- skins, and were both 

 green : they were now replaced. 



Sept. 10. — 8 larvfe advanced in 

 last stage, 1 of which had changed 

 in colour before pupation ; 1 was 

 dark brown, 4 greenish brown, and 

 2 brownish green. The greenest was 

 darker than any among the 9 larviB 

 in II., except a small one in the 

 latter. 



Of the 3 removed Sept. 1, 2 were 

 dark brown and 1 was green ; the 

 latter was on a brown surface, and 

 1 of the former on a green surface . 

 they were now replaced. 



Sept. 19. — 4 changed in colour 

 before pupation ; 4 brown and 1 

 green at earlier period of growth. 



Aug. 21. — A green larva of M. 

 persicariiE, 11-3 mm. long, found 

 Aug. 1!) on Rihes americana, was fed 

 on marigold in green surroundings 

 at this date. 



Aug. -^5. — The larva was changing 

 its skin ; also introduced 2 green 

 larvie (20-0 and 22-0 mm. long), the 

 smaller of which was found on mari- 

 gold at this date. 



Aug. 27. — Examined ; all 3 green. 



Aug. 28. — 9 more green larvffi 

 added (22-0, 20-0, 19-5, 17-3, 17-0, 

 16-0, 15-3, 14-3, and 14-0 mm. long), 

 found at this date on marigold. 



Aug. 30. — 1 larva, 26-3 mm. long, 

 has changed skin and become brown 

 (removed) ; 11 green. 



Sept. 1. — All green ; 1 dying and 

 removed ; 2 more green larvie added, 

 16-75 and 23-5 mm. long, the latter 

 changing last skin. The removed 

 larva was now a very greenish 

 brown. 



Sept. 9. — 9 larvffi alive, all in last 

 stage, 8 green, 1 brownish green (a 

 small larva). 



Sept. 19. — Only 2 still feeding, 2 

 pupating ; the rest dead, but no 

 more became brown. 



