ILLUSTRATIONS 



PLATES. 



Page. 



Plate I. Parasites of weevils. Fig. 1. — Eurytoma tylodermatis, pupa. Fig. 



2. — Catolaccus inccrtus, pupa. Fig. 3. — Cerambycobius cyaniceps, 



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



of Bracon. Fig. 6. — Bracon mellitor, pupa. Fig. 7. — Larva of chal- 



cidoid :^4 



II. The purple mallow (Callirrhoe involucrata) , a food plant of two wee- 

 vils related to the boll weevil. Fig. A. — The buds and flowers, which 

 are subject to attack by Anihonomus fulv us, and the capsule, subject 

 to attack of Macrorhoptus estriatus. Fig. B. — Bud Infested by 

 Anihonomus fulvus. Fig. C. — Flower injured by adult weevil 



of Anihonomus fulvus 40 



III. Biologies of weevils. Fig. A. — Pepper, showing egg punctures of 

 Anihonomus eugenii. Fig. B. — Head of Sidcranthus rubiginosus, 

 showing cell of Desmoris scapalis. Fig. C. — Pepper, showing Larva 

 of Anihonomus eugenii in situ. Fig. D. — Head of Sidcranthus 

 rubiginosus, with larva of Desmoris scapalis in its cell. Fig. E. — 

 Section of cotton square, showing pupa of Anihonomus grand is 

 and pupa of primary parasite Catolaccus inccrtus. Fig. F. — Earthen 

 cell of larva of Desmoris scapalis. Fig. G. — Desmoris scapalis. 

 adult weevil 40 



• TEXT FIGURES. 



Fin . 1. Bracon mellitor. parasite of boll weevil 10 



2. Pediculoidi s vt utricosus, mite enemy of boll weevil 10 



3. Sigalphus curculionis 11 



4. Map of Texas, divided into geographical regions and illustrating average 



percentage of parasitism of the boll weevil in all cotton forms 19 



5. Diagram of cotton plantation of H. 0. Samuel. Dallas, Tex., of 04.4 



acre-;, showing location of plats where observations and experiments 



on boll-weevil parasitism were made 25 



6. Occurrence of Catolaccus incertus, Bracon mellitor. Cerambycobius 



cyaniceps, and Eurytoma tylod( rmatis in Texas and western Louisiana. 30 

 8 



