1899-1900.] Dr E. Stewart MacDougall on Genus Pissodes. 339 
Date of Issue of 
New Imagos. 
No. 
Date of Issue of 
New Imagos. 
No. 
September 20, 1897 
1 
October 13, 1897 
1 
21 , „ 
1 
33 l*b 33 
1 
33 
22 
ua, ,, 
1 
,3 16, „ 
2 
3) 
23, „ 
1 
73 1^3 33 
3 
33 
24, „ 
3 
„ 18, „ 
1 
33 
25, „ 
2 
,3 1^3 33 
2 
33 
26, „ 
3 
21 
33 - JX 3 33 
2 
33 
27, „ 
1 
,3 24, „ 
1 
28, „ 
6 
33 2 5, ,, 
1 
17 
29, „ 
4 
„ 26, „ 
1 
33 
30, ,, 
1 
,3 28, „ 
1 
October 
1 , 1897 
2 
33 80, „ 
1 
31 
3 and 4, „ 
3 
33 81, ,, 
3 
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b, 33 
2 
November 3, 1897 
1 
33 
6 , 3, 
2 
33 6 , ,, 
1 
3) 
q 
*"'3 33 
1 
17 
33 L 1 7 33 
1 
33 
10 and 11 , „ 
2 
3, 20, „ 
1 
3 3 
12 , „ 
2 
,3 24, „ 
1 
On 24th December 1897 I removed the soil from the part of 
the pine a little below the ground, and on dissection came on two 
beds side by side, one containing a pupa and the other a larva. 
Before passing away from this part of the subject I would like 
to refer again briefly to the question of the generation. Limiting 
ourselves to one cycle, and to the earliest laid eggs of that cycle, 
let us ask — What is the generation of P. notatus ? 
We have seen that the imagos which issued in July 1895 from 
the pines brought from Munich fed till the autumn and hibernated 
on the approach of winter, and how, after hibernation, they 
copulated in spring 1896, the earliest of the resulting brood 
appearing in July 1896. These July 1896 beetles wintered in 
1896-97, appeared again in spring 1897, and from their copulation 
then a new brood began to issue in August 1897. 
Thus we have an annual generation, one brood in a calendar 
year. But it may be objected to this that the imagos which issue 
in early autumn will in the same year of their issue proceed to 
reproduction and egg-laying, from which eggs beetles would be 
developed say in June of the next year (winter having been passed 
