344 
Proceedings of Royal Society of Edinburgh. [sess. 
The record so far is : 
1 male died June 29, 1897, aged 23 months. 
1 female died August 1, 1897, aged 24 months. 
A S3 3 3 3) 33 
But the interest does not end here. Apart from the long life of 
these beetles, it is additionally interesting that a male should be 
the survivor. I had no doubt of the survivor being a male, 1 but 
to put the matter beyond doubt, I put this survivor under a bell 
jar with a female from another pine, and soon the two were in 
copula. 
This surviving male I placed on a new pine on 9th August 1897 
with a female of another brood. The further record is : 
No. of 
Notatus 
on Pine. 
No. of 
Pine. 
How long on 
Pine. 
Remarks. 
2 
40 
Aug. 9- Aug. 27 
New brood in July 1898. 
2 
45 
Aug. 27-Sept. 29 
New brood in 1898. 
On 29th September I placed these two beetles on a fresh pine, 
and up till 28th October I frequently saw them both on the pine, 
the male being now twenty-seven months old. In the beginning of 
November I looked again for the two beetles, but could only find 
the female. In spite of long search there was no trace of the male, 
and my hope was that it had proceeded to hibernation, nor was the 
hope vain, for on examination of the pine on 12th March 1898, I 
found the two beetles feeding on the plant, their probosces sunk 
deep in the bark. I placed these two beetles on a fresh pine on 
14th March, and continued to give them fresh material until the 
experiment ended by loss of the veteran male. The further record 
is as follows : — 
1 Owing to the close resemblance of males and females, in order to make 
recognition of sex sure I had adopted the following plan. When I found 
two beetles in copula I mutilated them by cutting off the tarsus of a leg, on 
the right side in the case of a male, on the left side in the case of a female. 
