the colours of certain Lepidoptera. 



297 



I. Dark Surroundings. 



Dead leaves, &c., intermixed 



with food-plant. 



Aug. 28. — 5 green BI. hrassicce 

 (24-3, 23-75, 22-3, 16-25, & 12-5 

 mm. long), 4 green H. oleracea 

 (19-0, 15-6, 11-3, cfe 9-7 mm. long), 

 and a small brownish green M. 

 hrassicce, all found on marigold, 

 were placed in dark surround- 

 ings on the same food-plant. 

 To these were also added 3 green 

 M. hrasaicce (23-9 mm. when 

 found on Aug. 21, 23-0 and 13-5 

 mm. when found on Aug. 25), 

 and 1 dark green Euplexia luci- 

 para (24-5 mm. when found on 

 Aug. 25), all from marigold, and 

 placed up to this date with the 

 BI. persicuricE in dark surround- 

 ings described on p. 299. 



Aug. 20.— 2 M. brassica had 

 become dark, 1 large and 1 

 having just changed skin. 



Aug. 30. — 1 small oleracea 

 (17-25 mm.) was becoming 

 darker ; 4 hrassicce had now 

 changed last skins, and 3 were 

 dark ; 1 oleracea and 2 hrassicce 

 were changing skins, and rest- 

 ing on brown leaves ; they were 

 removed for examination : 1 

 large green hrassicce added. 



Sept. 1. — The 31arvrt' removed 

 Aug. 30 had changed skins, and 

 were all brown ; they were re- 

 placed. Of the rest, 4 hrassicce 

 were brown (3 very dark) ; 1 

 oleracea was apparently darken- 

 ing gradually instead of sud- 

 denly alter an ecdysis. E. luci- 

 para still green. 1 green bras- 

 siccB changing skin on a brown 

 leaf was removed. The lar^e 

 fcrassic(K added Aug. 30 was still 

 green : it was now pupating and 

 removed. 



Sept. 10. — 2 oleracea alive; 

 1 about mature and brown, 1 

 changing skin and brownish. 

 6 M. hrassicce, all brown. 3 more 

 green oleracea added (about 

 17-5 mm. long). The green 

 larva changing skin and re- 

 moved Sept. 1 was now dark ; 

 it was replaced. 



II. Green 



Surroundings. 



Food- plant alone. 



Aug. 28. — 4 green 

 larvse of M. hrassicce, 

 24-0, 22-0, 20-0, and 

 16-0 mm. long, found 

 on marigold, together 

 with 4 green larvffi of 

 il. oleracea, 14-5, 13-25, 

 12-0, & 8-75 mm. long, 

 were introduced into 

 green surroundings ; 

 also another small 

 greenish M. hrassicce. 



Aug. 30.— 2 M. hras- 

 sicce had changed skins 

 and become dark (re- 

 moved). 



Sept. 1.— 1 M. hras- 

 sicce had changed last 

 skm and become dark 

 (removed). 



Sept. 10.-3 H. ole- 

 racea about mature, 2 

 green, 1 brown. 2 M. 

 hrassicce, 1 nearly ma- 

 ture, 1 small; both 

 green. 1 green oleracea 

 added, 2U-0 mm. long 

 when extended in walk- 

 ing ; it was changing 

 its skin. 



III. Green 



Surroundings. 



Food-plant alone. 



Aug. 80.— The 2 

 removed from II 

 placed here. 



Sept. 1. — They 

 were a very green- 

 ish brown : the 

 third dark larva 

 from II. added. 



Sept. 10.— Only 

 2 found ; 1 darkish 

 brown, 1 lightish 

 brown. The latter 

 died ; the former 

 was replaced in II. 



TRANS. ENT. SOC. LOND. 1892. PART IV. (DKC.) 2 A 



