EXPLANATION OF PLATE. 



Fig. 1. Section of closed cell with lid torn off, showing what I suppose 

 to be an egg of Rhipiphorus near the mouth (slightly magnified). 



Fig. 2. The supposed egg in fig. 1, more magnified. 



Fig. 3. Wasp-grub taken from a closed cell, with a young Rhipiphorus 

 fastened across its head. 



Fig. 4. "Wasp-grub taken from a closed cell, with a young Rhipiphorus in 

 its most usual position, lying fastened across its breast like a baby. 



Fig. 5. Rhipiph or us with wasp-grub nearly consumed ; side view; mag- 

 nified four times. 



Fig. 6. The same ; three-quarters front view. 



Fig. 7. The same ; three-quarters back view. 



Fig. 8. Mature Rhipiphorus-la,x\a, after it has finished eating the grub ; 

 side view ; magnified seven times. 



Fig. 9. The same ; front view ; magnified seven times. 



Fig. 10. Head of Rhipiphorus-lnrya,, much magnified. 



Fig. 11. The same, looking down on mouth, still more magnified. 



Fig. 12. Mouth, showing mandibles looked-at end on. 



Fig. 13. Mandible, side view. 



Fig. 14. Legs, much magnified. 



Fig. 15. The same, still more magnified. 



Fig. 16. Cell of wasp, showing ordinary position of wasp's egg. 



Fig. 17. Wasp-grub; back view ; magnified four times. 



Fig. 18. The same ; side view ; magnified four times. 



