PLATE LVII 



Figure 1. The larva of Ctenocephalus felts, x 28. 



Figure 2. The terminal segments of the same. 



Figure 3. The anal process of same. 



Figure 4. The pupa of Ctenocephalns felis, removed from its 



cocoon. 



Figure 5. The alimentary tract of the larva of Ct. felis. 

 Figure 6. The salivary glands of the larva. 

 Figure 7. The mass of cells on the wall of the hind-gut, marked 



x in figure 5. 



Figure 8. The antenna of the larva of Ct. felis. 

 Figure 9. The mandible of the larva of Echidnophaga gall\na- 



ceus. Note the serrated border. 



Figure 10. The terminal segments of the larva of E. gallinaceus. 

 Figure 11, 12, and 13. The 'circus' method of controlling 



single fleas for experimental purposes, after Noller. 

 Figure 14. The antenna of the larva of Echidnophaga gallinaceus. 

 Figure 15. The larva of Echidnophaga gallinaceus. x 28. 

 Figure 16. The egg of Ct. felis. 



