ExPERIArENTS XI. — XIV, 



XL 



Lamp-shade. 

 Hehjht . . 165 mm. 

 Approx. cap. 1350 cc. 



Green leaves and 

 shoots of Populus ni- 

 gra alone. 



XII. 



Lamp-shade. 

 Height . . 131 mm. 

 Approx. cap. 650 cc. 



As in XI. 



July 9. — 20 young 

 larvffi introduced from 

 the "first stock," hav- 

 ing been on the same 

 surroundings with 

 many others since 

 hatching, & the leaves 

 having become rather 

 withered. 



July 21. — Length 

 from io-O to 20-U mm. 

 12 larva' green, 

 1 ,, greenish, 

 7 ,, brown, 

 but only 1 of them 

 darkish brown. 



July 30.— 20 alive. 

 Bright green : 

 11 in last stage, 

 G changing last skin 

 1 last stage but one. 

 Intermediate, perhaps 

 greenish : 

 1 changing last skin. 

 Very light broirn, per- 

 haps intermediate : 

 1 (stage unnoted, 



probably young). 

 Aug. 7. — All in last 

 stage, and many pu- 

 pating. 



All bright green, 11 

 without the brown dor- 

 sal stripe, or with it 

 very faint, 8 with it 

 distinct, the latter 

 being generally the 

 smaller larvas. 



July 10.— 20 young 

 larva3 introduced ; 



hitherto as in XL 



July 17. — 18 alive ; 

 for the most part they 

 remained brown. 



XIII. 



Lamp-shade. 

 Height . . 130 mm. 

 Approx. cap. 800 cc. 



As in XL 



XIV. 

 Lamp-shade. 

 Height . . 163 mm, 

 Approx. cap. 1300 cc. 



July 23.- 17 alive ; 

 14 brown, 

 3 green. 



July_ 30. 

 Bright green : 

 1 in last stage but one 

 Greenish : 

 1 in last stage, 



1 changing last skin. 

 Light brown : 



11 in last stage, 



2 ,, but one 

 1 changing last skin. 



Aug. 7. — • All in last 

 stage : 

 2 bright green (1 with 

 and 1 without dor- 

 sal stripe). 

 2 greyiah intermediate 

 13 li(jht brown, like the 

 7 of XIII. and the 

 10 of VI. 



July 10. — 20 young 

 larvffi introduced as in 

 XL 



July 23.-20 alive : 

 8 brown, 

 12 green or greenish. 



Aug. 1. 



Briglit green : 

 3 in last stage. 



Greenish : 

 6 in last stage, 

 1 changing last skin 

 Broiunish intermediate: 

 1 in last stage but one 



Light brown : 

 8 in last stage, 

 1 changing last skin 



Aug. 5. — In last stage. 

 3 b rigid green (1 

 small), 



6 dull but distinct 

 green (marked 

 brown dorsal line), 



1 greenisli inter- 

 mediate, 



1 bro^vnish inter- 

 mediate, 



7 light brown (1 

 rather darker than 

 others), 



1 rich brown (small), 

 changing last skin 



1 intermediate. 

 The 7 light lirown much 

 resembled the 10 of VI. 



As in XL, except 

 that abundant golden 

 green, smooth, stripped 

 twigs of Salix vimi- 

 nalis were intermixed. 

 These retained their 

 colour a long time, and 

 only became a light 

 greenish brown when a 

 change eventually oc- 

 curred, but the larviB 

 had then ceased to be 

 sensitive. 



July 10. — 40 young 

 larvffi introduced as in 

 XL 



July 16. — G larvffi 

 removed to put in 

 XXXIV. 



July 19.-33 count- 

 ed, of which 30 green 

 or greenish (mostly 

 former), & 3 brownish 

 (not dark), & of these 

 1 quite small. Usual 

 length 17-0 mm. 



July 26. — 33 alive ; 

 all bright green except 

 1 small larva, which is 

 intermediate. 4 just 

 before changing last 

 skin were removed to 

 XXVI. to test whether 

 any further change is 

 now possible. 



July 31.— All bright 



green : 



Last stage , , , 24 



Changing last skin 3 



Last stage but one 2 



1 of the 2 last was re- 

 moved to XXVI. , being 

 added to the 4 removed 

 July 26, 



Aug. 7, — All in last 

 stage : 

 24 bright green, with- 

 out brown dorsal 

 stripe or with it 

 very faint (most 

 l^uijating), 

 4 light green, with 

 dorsal line dis- 

 tinct (all these 

 small in stage). 



