1899-1900.] Dr R Stewart MacDougall on Genus Pissodes. 351 
experiment will still further prove the continuance of the egg- 
laying. 
1 
No. of 
Pine. 
No. of 
Beetles. 
How long Beetles 
on Pine. 
Proof of Egg-laying. 
2 
October 12, 1896, 
to 
June 21, 1897 
New brood issued September 1897. 
3 
6 
June 21 
to 
July 7, 1897 
Larvae on dissection. 
4 
5 
July 7 
to 
July 28, 1897 
Dissection on December 4 showed 
larvae in beds. Before the end of 
the first fortnight of July 1898 a 
number of beetles had issued. 
On July 22 and 23, 15 more. 
,, 25, 4 ,, 
,, ,, 29, 6 ,, 
,, „ 31, 1 „ 
„ August 4, 3 ,, 
„ „ 13, 2 „ 
„ „ 25, 1 „ 
In beginning of August 1898 a new 
brood. 
5 
4 
July 28 
to 
August 28, 1897 
6 
3 
August 28 
to 
October 2, 1897 
On 2nd October 1897 the three piniphilus were placed on a new 
pine, on which they remained feeding till the middle of November, 
when they proceeded to their second hibernation. On 19th March 
1898 I found them above ground again feeding on the plant. 
They were at this time twenty months old. 
P. piniphilus then resembles P. notatus in its long life as imago 
and in the continued egg-laying. The generation, following one 
cycle, is at the most a yearly one, even with the unfavourable 
condition of development being retarded by the intervention of 
winter. 
Pissodes pini (L.). 
Description . — This beetle measures f inch in length, and is red- 
brown to black-brown in colour, with sparse yellow scales on both 
upper and lower surfaces. The punctured thorax has a fine 
raised middle line ; its posterior corners are right-angled, and the 
