Aug. 28, 1916 



Thersilochus Conotracheli 



849 



Table i. — Emergence of adults of Thersilochus conotracheli from cocoons collected at 

 Douglas, Mich., and reared at Vienna, Va., in ign 



9- 

 10. 

 11. 

 12. 

 13- 

 IS- 

 16. 

 iS. 



19. 



22. 



24- 



27- 

 28. 

 29. 



3°- 



32- 



33- 

 35- 

 37- 



No. 



Total 



Average date of emergence 

 Percentage of sexes 



Date 

 emerged. 



May 22 



23 

 25 

 27 

 28 

 29 

 30 



3 1 



June 1 



2 



3 



5 

 6 



14 

 17 



18 



*9 

 20 

 22 

 2 3 



25 

 27 



Males. 



38 

 May 27 



38.39 



Females. 



6 



3 

 2 



11 

 5 

 3 

 3 

 3 



61 



June 7 



61.61 



LONGEVITY OF THE ADULT 



Some data on the longevity of the adult were obtained in 191 1 from 

 specimens reared at Vienna, Va., from the cocoons collected by Mr. 

 Hammar at Douglas, Mich. Only females were used. Ten of these 

 were divided into three lots, as follows : Four were placed in vials without 

 food or water, three with water, and three with dilute sugar sirup. Of 

 those without food or water one lived 4 days, two lived 3 days, and 

 one lived 1 day. One of those provided with water lived 7 days, one 6 

 days, and one 4 days. Those fed with sirup lived 10 days, 13 days, and 

 15 days. The confinement in the vials undoubtedly shortened the life, 

 even of the sirup-fed specimens, but the figures show the necessity for 

 both food and water; for those given clear water lived, on the average, 

 more than twice as long as those without food or water, and those 

 provided with sirup lived more than four and one-half times as long. 



STAGE OF HOST ATTACKED 



Parasitization takes place while the curculio larva is still very small, 

 probably from the time it hatches until in its burrowing into the fruit it 

 gets beyond the reach of the ovipositor of the parasite. 

 52172°— 1&— 2 



