326 Proceedings of the Royal Society of Edinburgh. [Sess. 
a month later. In these observations a moult escaped notice, which was 
observed, however, in the next series, where I refer to it. 
Considering the amount of disturbance the larvae in these experiments 
were subjected to, the results were very successful. 
Series 3. 
This series was conducted with Braconids reared in the laboratory from 
the Series 2 experiments. They were limited in number owing to the 
weevil grubs pupating when brought in from the field. 
Exjpt. No. 1. 
August 3. 1 male and 1 female put in cage with bark containing 
2 weevil grubs. 
„ 6. 22 Bracon eggs on the prothorax of one of the grubs; this 
grub was transferred to another cage, and is referred 
to as grub a. The male Bracon was unfortunately 
destroyed; it was replaced by another. No further 
pairing was observed. 
„ 7. Female Bracon active in gallery of second grub, later referred 
to as grub b. 
„ 10. Eggs on grub a hatched. Larvae in first instar. Grub b 
deposited on. 
„ 11. Brood a larvae still in first instar. Newly hatched larvae 
crawling on grub b. 
„ 12. Larvae of both broods in second instar. 
„ 13. Larvae of both broods spotted. 
„ 14. Larvae of brood a have moulted a third time, but are still 
exactly similar to the preceding on second-stage larvae. 
This gives a moult between the second and so-called third 
stage of the previous experiments. 
„ 15. Larvae of brood a in fourth instar. Larvae of brood b, some in 
third and some in fourth. A third Hylobius grub (referred 
to as c) was introduced to the male and female Bracon 
from which broods a and b have been removed. 
„ 16. Larvae of brood a in fifth stage, of brood b in fourth stage. 
Numerous Bracon eggs on the prothorax of grub c. 
„ 18. Brood a larvae spun up; brood b larvae spinning. Eggs on 
grub c hatched, the larvae being in the first stage. 
„ 21. Brood c larvae in third stage; other broods spun up. 
„ 23. Brood c larvae, some in fourth and some in fifth stage. 
