327 
191 5-1 G.] Structure and Life-History of Bracon sp. 
August 24. All brood c larvae in fifth stage. 
„ 25. Brood c larvae spinning. 
„ 27. Brood c spun up. 
September 8. 2 cocoons of brood a empty, both emerged Bracons being 
males. 1 female has emerged from brood b. 
„ 11. No more adults emerged. 
Expt. No. 2. 
August 10. Male and female Bracon put in cage with bark containing 
Hylobius grub. 
„ 13. Weevil grub infested with eelworms. 
,, 14. Weevil grub dead ; replaced by another in fresh bark. 
„ 18. This new grub deposited on. 
„ 19. A few of the eggs have hatched, and the Bracon larvae are 
feeding. 
„ 20. All the eggs have hatched, and all the larvae are in the first stage. 
, 21. Some of the larvae are in the first stage, some in the second. 
, 23. Larvae all in third stage. 
„ 25. Some of the larvae in fourth stage, others in fifth. 
„ 30. All the larvae are spun up. 
September 9. 3 females emerged. 
„ 11. No more adults emerged. 
Ewpt. No. 3. 
August 11. Male and female Bracon placed in cage with bark containing 
Hylobius grub. 
„ 13. Weevil grub pupated. 
„ 17. No eggs of Bracon on this pupa. 
„ 20. Experiment closed. 
The small number of adults obtained in these experiments is accounted 
for by the fact that several larvae in each brood were sacrificed for purposes 
of description, and others were greatly disturbed and so failed to attain 
the adult state. 
Roof Experiment. 
This experiment was carried out on the roof of the laboratory. The 
Bracons were supplied with bark containing Hylobius grubs and placed 
in a large box with muslin lid. The bark was placed in moss to retain 
moisture as far as possible. The insects were exposed to atmospheric 
conditions and the experiments arranged to be as natural as possible. 
