1899-1900.] Dr E. S. MacDougall on Scolytus multistriatus. 363 
lens, meant a handling of them such as might have risked their 
life, and as my material was not plentiful, I was unwilling to run 
the risk of loss. 
Examination of the two branches on 5th August revealed several 
entrance holes in the bark, a slight outflow of sap marking the 
place of the beetles’ entry. Three of the eleven beetles were lying 
dead in the bottom of the sack. On 20th September other two 
dead beetles were found, and a live one, which I kept out. 
On 10th February 1899 one of the branches was carefully dis- 
sected, an entrance hole being followed up, when I found that at 
this place a mother gallery had been made and eggs had been 
laid, the larvae — exposed by the scalpel — having started to gnaw 
out their galleries. These larvae were very small, and had not pro- 
gressed far from the mother tunnel. As the year went on constant 
examination was made regarding the imago issue, and at last, on 13th 
July, the first new 
beetle issued. Here is the record of escape 
from these 
branches 
: — 
Date of 
Number of 
Date of 
Number of 
Issue. 
Beetles. 
Issue. 
Beetles. 
1899. Jnlv 13 .... 
1 
1899, Aug. 5 ... 
4 
y j 
14 .... 
2 
6 
3 
? ? 
16 .... 
2 
) 5 
„ 7 ... 
1 
5 5 
18 .... 
1 
„ 8 ... 
1 
20 
9 
„ 9 ... 
1 
21 
3 
„ 10 ... 
1 
22 
1* 
„ 11 ... 
6 
5 ? 
24 
3 
„ 13 ... 
7 
V 
26 
.... 1 
„ 15 ... 
2 
29 
4 
„ 19 ... 
1 
5? 
30 
3 
„ 21/22... 
...... 12 
31 ..... 
1 
„ 24 .... 
...... 1 
Aug:. 
3 
.... 4 
„ 26 ..., 
1 
4 
.... 3 
Oct. 13 .... 
2 
Dissection of the branches on 13th October showed several full- 
fed larvae in their beds. 
From the foregoing experiments and observations it will have 
been noticed that the earliest time of issue for the adult beetle 
has always been June or July. The generation of the June or 
* A larva and a pupa lay not far from the exit hole of this beetle. 
