1899-1900.] Dr E. S. MacDougall on Scolyius multistriatus. 361 
the full-fed grub pupates in an oval bed hollowed out in the bark, 
whence later, after pupation, the imago bores out through bed and 
bark, the flight holes on stem or branch from which a brood has 
issued resembling a number of small shot-holes. If one examine 
the beetles in their beds soon after they have ceased to be pupae, 
their colour is light-brown yellow, with dark glossy heads. 
While continental writers were unanimous on the point of 
multistriatus being a late s warmer, not appearing, it was said, 
until a summer temperature had been reached, there were no 
experimental records as to the length of time necessary for the 
completion of the life cycle, and partly to make certain of this 
and partly to determine whether multistriatus would attack (and 
be successful in attack) a healthy tree, I undertook my experiment. 
Previous to the experiment, I had recorded several observations 
of this beetle in my notes. Thus in Munich, in the autumn of 
1894, several elm logs on dissection showed larvae of multistriatus. 
These logs after being kept in water for some time were placed 
in a room, where they remained quite dry until the spring of 1895, 
when, again, they were placed in water. At the end of June and 
in the first days of July, the beetles began to issue from the logs. 
Again, in Munich, in the laboratory of Professor Pauly, I noted 
escape of beetles as 
follows : — 
Date of 
Number of 
Date of 
Number of 
Issue. 
Beetles. 
Issue. 
Beetles. 
1895, July 
1 .... 
144 
1895, July 11 .. 
7 
2 .... 
16 
„ 12 .. 
4 
55 
3 .... 
20 
55 
„ 13 .. 
1 
5? 
4 .... 
13 
„ 14 .. 
2 
55 
5 
.. .. 4 
55 
,, 15 .. 
1 
5 5 
6 .... 
8 
16 
1 
55 
55 
7 .... 
5 
3 7 w - 
With some of this material I started an experiment in Munich, 
and in July 1896 brought with me to the Eoyal Botanic Garden, 
Edinburgh, from Munich, the sack containing the prepared pieces 
of elm and the beetles. From pressure of work, however, I was 
unable to attend further to the matter. In the autumn of 1897, 
when removing the pieces of elm from the sack in which they had 
been standing since July 1896, I noticed them covered with 
