330 
Professor E. B. Poulton on colowr-relation 
Dates in 
1893, 
glossy twigs, 
Dark a eatte brown 
probably of birch, 
Aug. 
| 9 on twigs, 4 on 
| green. All dark brown, 
some with 
green. 
Aug. 
(Aug. 10.) 
twigs, on green. 
11 purplish-brown, 2 
rather paler. Several 
larve with green 
patches on sides, 
9 
= 
Aug. 
12 on twigs, 1 on 
green. As before. 
11 on| 
| XI. 
| Reddish-brown 
twigs. 
(Auigs ie), 4 
twigs, 1 on green. 
on 
a little | 
(Aug. OS) als on: 
twigs, 2 on green. 
All brown, mostly 
rather darker than 
| twigs, but 4 rather 
paler, Several patched 
|W. vith green. 
12 
green. 
on twigs, 3. on 
As before. 
Aug. 
10 on twigs, 
green. Purplish- 
brown, several with a 
little green, 2 rather 
paler brown. 
2 on| 
10 on n twigs, 5 on 
green. <All brown, 
several patched with 
| green. 
8 on twigs, 4 on 
green. 10 purplish- 
brown, 2 brown. Only 
1 or 2 slightly marked 
with green. 
(Aug. 25.) 
sticks. 
9 on sticks, 2 on 
green. 1 mature. 
12 on| 
(Aug. 22.) 12 
twigs, 3 on green. 
All brown, 8 resemb- 
ling twigs, 2 rather 
darker, 2 ~~ rather 
lighter. 
Re-fed. 
on 
XI. | 
Bark covered with = | 
bright yellowish-green 
powdery lichen, the colour 
of which faded and left | 
the dark bark. } 
——} 
| 
10 on bark, 3 on) 
green. 10 of a rich 
dark brown patched | 
with lighter brown | 
and green: 3 lighter 
brown variegated with | 
still paler brown and. 
green. All but one of | 
these paler larvee with | 
little white dashes on 
sides. The greenmarks | 
less pronounced than 
in XIII and XIV. 
10 on bark, 2 on; 
green, 1 on muslin. 
| 
| 
| 
{ 
—} 
10 on) 
~ (Aug. 14.) 
bark, 2 on green, All| 
but 2 very dark brown, | 
with far less green | 
than XIII and XIV, 
| 
12 larvie, as before. 
(Aug. 22.)\" (Seon 
bark, 3 on green. 
10 on bark, 2 dead. 
2 mature, and 
more on Aug. 31. 
2 
“ 
2 
All 
Mostly mature. 
feeding Sept. 8. 
mature Sept. 13. 
(Sept. 4.) Nearly | 
all mature. Only 1 
feeding Sept. 9. 
6 on bark, | 4 on 
green. The colour of 
the tichen had faded, 
and left the dark 
bark. 
(Sept. 4. vn Larvie 
becoming mature. <A 
few still feeding Sept. 
9 and 13. 
| 
