1899-im] Dr E. Stewart MacDougall on Genus Pissodes. 343 
food material, the pine being hard and dead. I was still left, 
however, with the four notatus previously isolated. On 2nd 
October 1896 I placed these four on a fresh pine, surrounded as 
usual with muslin, and having thrown a handful of moss on the 
surface soil of the pot, I placed the pine outside in the garden, 
giving the protection of a glass roof in case any heavy snowfall 
during the winter might bring the experiment to an untimely end. 
On 5th March 1897, on examining the pine, and pulling aside 
the moss, I noticed a slight movement of the soil on the surface, 
and soon had the pleasure of seeing, from the place of movement, 
one of my old notatus appearing after hibernation. 
I replaced the moss, and once more surrounding the pine with 
muslin, left it outside. 
On 20th March 1897, a sunny day, I examined the pine again, 
and found all the four notatus on the pine. Up to this time the 
beetles were twenty months old (as imagos), and had hibernated 
twice, in the winters of 1895-96 and 1896-97. 
On 20th March 1897 I removed the four beetles to a new pine, 
and changed them later on the following dates and with the follow- 
ing results : — - 
No. of 
Notatus 
on Pine. 
No. of 
Pine. 
How long on Pine. 
Proof of Egg- 
laying. 
Remarks. 
4 
9 
Mar. 20-Apr. 15, 1897 
Found larvae 
Dissected this pine before 
issue of new brood. 
4 
12 
Apr. 15-May 10, ,, 
Got new brood of 
beetles 
First new imago issued 
August 23, 1897. 
4 
16 
May 10-May 25, „ 
5 * 
First new imago issued 
August 24, 1897. 
4 
17 and 18 
May 25-June 3, ,, 
First new imago issued 
September 29, 1897. 
4 
20 
June 3- June 29, „ 
When removing the 
beetles on June 29, 
three of the four were 
active. The fourth 
was lying on the soil, 
and died in a short 
time. This was a 
male. 
First new imago issued 
September 22, 1897. 
3 
27 
June 29- July 10, 1897 
Found larvae and 
pupae on dissection 
3 
31 
July 10- July 28, „ 
Found larvae on 
dissection 
3 
36 
July 28-Aug. 9, ,, 
On 1st August, while examining Pine 36, I found one notatus 
lying dead on the surface of the earth. On 9th August another died. 
Only one veteran notatus now remained alive. 
