ILLUSTRATIONS. 



Page. 



Fig. 1. Vials used for the study of thrips parasite.-; 29 



2. Cage for rearing parasites 30 



3. Parasitized prepupse of Heliothrips fasciatus 31 



4. Diagram illustrating length of time from appearance of parasitism to 



formation of parasite pupse of Thripoctenus russelli, July-October, 



1911 32 



5. Thripoctenus russelli: Pupa, vent ral view 33 



6. Diagram illustrating length of pupal stage in 146 individuals of Thripoc- 



tenus russelli 34 



7 . Thripoctenus russelli: Adult ^ 35 



8. Diagram illustrating length of time from oviposition to first evidence of 



parasitism for 353 individuals of Thripoctenus russelli 47 



9. Diagram illustrating length of time from ovii^osition to pupation for 241 



individuals of Thripoctenus russelli 48 



10. Diagram illustrating total number of days in the life cycle of Thripoc- 



tenus russelli; summary of all rearing experiments 49 



11. Mailing tubes used in shipment of thrips i)arasites 51 



IV 



