1899-1900.] Dr E. Stewart MacDougall on Genus Pissodes. 345 
No. of 
Pine. 
No. of 
Beetles. 
Length of time 
on Pine. 
Proof of Egg-laying. 
52 
2 
Mar. 14-Apr. 20, 1898. 
Got new brood later in same year. 
58 
2 
Apr. 20-May 10, ,, 
JJ J? 99 
60 
2 
May 10-May 27, ,, 
62 
2 
May 27- June 22, ,, 
Larvae and pupae got on dissection. 
64 
2 
June 22-July 9, ,, 
Larvae on dissection. 
66 
2 
July 11-Aug. 3, ,, 
}> 5J 
On 3rd August 1898 I placed the male on a fresh pine, and 
observed it alive several times during the month. On 31st August 
I undid the muslin sack, but could not find the beetle. Further 
prolonged search for it was also unsuccessful. At the time of this 
loss the male had lived with me as imago for over three years. 
The long life of the adult beetles can be shown in another way. 
In one series of experiments during 1897 1 began on 1st April with 
thirty-six notatus. These thirty-six were without exception adults 
which had issued from the experimental pines in August, Sep- 
tember or October 1896, and had passed the winter of 1896-97 
hibernating in the soil. 
From 1st April 1897 till 1st October 1897 these notatus, which 
were distributed over various pines, were looked for and changed to 
fresh material at intervals of a fortnight and over. At the last 
change, in the beginning of October, twenty-seven of these beetles 
were alive, a fairly equal mixture of males and females. Eggs had 
been laid from the end of April onwards up to and including 
September. The further fate of these notatus is as follows — 
Fate of Thirty -six Beetles with ivhich Experiment was started 
on ls£ April 1897. 
Alive and Feed- 
ing on Pines 
during October 
and November 
1897, previous to 
Hibernation. 
Found Dead 
during the 
Year. 
Not Found in 
spite of Search 
when Remov- 
ing to Fresh 
Material. 
Lost or 
Escaped while 
Changing. 
Accidentally 
Killed. 
27 
1 on June 21 
1 on July 16 
1 on July 16 
1 on July 31 
1 on July 31 
1 on July 31 
Ion August 28 
1 on October 1 
1 on October 1 
