L LUSTRATIONS 



PLATES. 



Page. 



Plate I. Shedding and retention of formg on the cotton plant. Fig. 1. — Normal 

 scars left by shed forms. Fig. 2. — Abnormal scars with forms 

 retained. Fig. 3. — Longitudinal section through base of retained 



form 16 



II. Eggs of boll-weevil parasites. Fig. 1. — Microdontomerus anthonomi. 

 Fig. 2. — Unidentified egg. Fig. 3. — Ceramhycohius cyaniceps. 

 Fig. 4, — Eurytoma tylodermatis . Fig. 5. — Catolaccus hunteri. Fig. 



6. — Unidentified egg 56 



III. Parasites of weevils. Fig. 1. — Eurytoma tylodermatis, ^^Vi^^i.. Fig. 2. — 

 Catolaccus incertus, pupa. Fig. 3. — Ceramhycohius cyaniceps, pupa. 

 Fig. 4. — Microdontomerus anthonomi, pupa. Fig. 5. — Larva of 

 Microbracon. Fig. 6. — Microhracon mellitor, pupa. Fig. 7. — Larva 

 of chalcidoid 56 



TEXT FIGURES. 



Fig. 1. Diagram illustrating the monthly percentage of mortality of immature 



boll weevils due to insect enemies 19 



2. Diagram illustrating the average climatic and insect control of the 



immature boll weevils during 1906, 1907, 1908, and 1909, in hanging 

 squares 21 



3. Diagram illustrating the average climatic and insect control of the 



immature boll weevils during 1906, 1907, 1908, and 1909, in fallen 

 squares 22 



4. Diagram illustrating Texas climatic variations in 1907, 1908, and 1909. 36 



5. Diagram illustrating Louisiana climatic variations in 1907, 1908, and 



1909 37 



6. Diagram illustrating the boll-weevil complex 44 



7. Diagram gi\dng the parasites of the boll weevil and their other hosts . 45 



8. Pediculoides ventricosus: Adult female, before and after inflation of 



abdomen with eggs and young 46 



9. Microdontomerus anthonomi: Adult 49 



10. Hahrocytus piercei: Pupa 52 



11. Sigalphus curculionis: Male, female, antenna 53 



12. Microhracon mellitor: Adult 54 



13. Diagram illustrating yearly rank of the boll-weevil parasites, 1906, 



1907, 1908, and 1909 62 



14. Map showing the distribution of the more important parasites of the 



boll weevil 63 



15. Diagram illustrating the seasonal rotation of hosts of Catolaccus hunteri 



and Ceramhycohius cyaniceps 67 



16. The "fire ant " (Solenopsis geminata): Worker 70 



17. The little black ant ( Monomorium minimum) : Adult, egg, larva, pupa . 71 



6 



