1915-16.] Structure and Life-History of Bracon sp. 325 
June 5. Larvae now 1*8 mm. long, markedly spotted. 
„ 6. Larvae on grub have moulted a third time. The larvae measure 
5 mm. ; they are now covered with fine reddish hairs. 
The spiracles are visible, and through the skin the tracheae. 
„ 8. Larvae measure 6*5 mm. 
„ 10. Larvae spinning. 
„ 11. Larvae are spun up. 
„ 20. Opened 2 cocoons ; they contained pupae. 
„ 30. 1 male and 1 female Bracon emerged from the cocoons. 
July 20. 4 females emerged. 
August 2. 1 male emerged. 
„ 6. 2 females and 5 males emerged. 
Exjpt. No. 2. 
May 27. 1 male and 1 female Bracon placed in cage with Hylobins grub. 
June 4. Bracon eggs on Hylobins grub. 
„ 5. No progress. 
„ 8. No progress. 
„ 11. Eggs still unhatched ; grub discoloured ; experiment closed. 
Expt. No. 3. 
May 27. 1 male and 1 female Bracon placed in cage with bark containing 
a Hylobins grub. 
„ 28. Cage placed in the dark. 
„ 31. 6 eggs of Bracon laid on Hylobins grub. 
June 3. The eggs have hatched. 
oo 
„ 5. Bracon larvae have moulted and are now in second instar ; they 
are markedly spotted. 
„ 9. A third moult has taken place. 
„ 10. Larvae measure 5 mm. long. 
„ 11. A fourth moult has taken place; the larvae are now in the 
final stage. 
„ 14. Larvae spinning. 
„ 15. Larvae spun up. 
July 5. 2 cocoons were examined and contained pupae. 
August 6. 2 males and 1 female emerged. 
Information on the larval moults and on the general life-history were 
obtained in the course of these experiments. In the first experiment of 
this series a marked disparity in the dates of emergence will be noticed, 
the first adults emerging on June 30 and the last on August 6, more than 
