Yl Rs Aa 
I found it paired in the box, and it laid 
162 eggs, 21 June. 
Eggs laid 21 June. 
Eges hatched 1 July. Time 10 days. 
Larva, ist molt4 July. “ 3 * 
art acai: (2S: 9 mess eet rons 
oe 3rd oe 13 ee we 4 ee 
In cocoon LS 4 hig dat 
First moths issued 12 Aug. 
days. 
Whole larval period, 18 days. 
From egg to imago, 52 days. 
The behavior of the pupae of this brood 
was in this way. On 12 Aug., 2 ¢ 
emerged. As I desired to keep exam- 
ples of the moth of each brood for com- 
parison, I killed these, expecting to see 
plenty more. On 13 Aug. 392 emerged ; 
on 14, 19 ; on 15, 29-; on 16, 1 9’; on 
17,1 2 ; and no more of either sex ap- 
peared. So I lost the opportunity of 
mating any females in the boxes. I tied 
all these 9 9 out at night and kept them 
out several nights, bringing them to the 
house during daylight, until all of them 
were broken up, but in no case did a male 
visit them. That means that at this pe- 
riod no wild males were flying in the 
vicinity. Had I kept the males which 
issued 12 Aug., another brood would 
have been raised, making the third in 
succession. As it was, the females tied 
out laid many unimpregnated eggs on 
the trees to which I confined them. An- 
other 9 emerging from the first lot of 
cocoons on 16 July gave me another 
opportunity of verifying my observations. 
Eggs laid 17 July. 
Eges hatched 27 July. Time 10 days. 
Larva, lstmolt,1 Aug. ‘“ 4 * 
Time 25 
173 
Larva, 2nd molt, 6 Aug. Time 5 days. 
1 i we oe 5 ee 
In cocoon Wie} OS | faery 
Whole larval period 22 days. 
No moths issued from this lot, but all 
About two- 
thirds of the cocoous from the eggs laid 
21 June gave imagos, and about one- 
third are wintering. But both these last 
broods, as I have said before, came from 
+. 3rd as 
the cocoons are wintering. 
the first lot of cocoons. 
I was careful at all points in these two 
broods, the more so as my attention had 
been directed to the different results be- 
tween my observations and others re- 
corded. The rapidity of the changes in 
both broods, caused by the hot weather, 
no doubt, will be noticed, in one brood 
but 3 to 5 days intervening between any 
of the molts, in the other from 4 to 5. 
In the last stage of the second brood 
the time was 7 (from third molt to 
cocoon). In this last brood it happened 
that I painted red a part of the last seg- 
ment of every larva just after the third 
molt. ‘These red marks were not lost, 
but stuck to the larvae till they disap- 
peared in their cocoons. Ido not remem- 
ber ever reading of this device for 
identifying larvae, but with light colored 
and smooth-skinned ones, it answers 
admirably. 
So I am thoroughly satisfied that C-. 
promethea, at Coalburgh, passes but 
three molts, and it becomes very proba- 
ble that this species at least varies in 
the number of molts with the latitude 
or locality. At Albany, N.Y., I suppose 
there is but one annual brood. Mr. 
Lintner found the period from the laying 
