Xii Journal of Agricultural Research voi.xx 



2. Graph showing relation of freezing-point depressions in soil (calculated to 



17 per cent moisture) to total solids extracted by 5 parts of water to 1 of Page 

 soil 3 8 3 



Effect of Season and Crop Growth on the Physical State of the Soil 



Text Figures 



1. Effect of crop on physical state and electrolyte concentration of the water 



extract of the soil 39^ 



2. Effect of crop on physical state and electrolyte concentration of the water 



extract of the soil 399 



3. Effect of crop on physical state and electrolyte concentration of the water 



extract of the soil 400 



4. Effect of crop on physical state and electrolyte concentration of the water 



extract of the soil 4 QI 



Rice Weevil, (Calandra) Sitophilus oryza 

 Plate 



60. Sitophilus oryza: A. — Egg. B. — Pupa, dorsal aspect. C. — Pupa, lateral 

 aspect. D. — Pupa, ventral aspect. E. — Adult. F. — Third-stage larva. 

 G. — First-stage larva. H. — Second-stage larva. I. — Fourth-stage larva. 422 



Opius fletcheri as a Parasite of the Melon Fly in Hawaii 

 Text Figures 



1 . Opius fletcheri: Egg just deposited 424 



2. Opius fletcheri: Mature egg 4 2 4 



3. Opius fletcheri: Larva, first instar, ventral aspect, showing head characters 



and complete tracheal system, and the egg serosal cells 425 



4. Opius fletcheri: Molted skin of first-instar larva, showing the absence of 



egg serosal cells 4 2 ^ 



5. Opius fletcheri: New second-instar larva 4 2 7 



6. Opius fletcheri: Mandible of second-instar larva 427 



7. Opius fletcheri: Mandible of third-instar larva 427 



8. Opius fletcheri: Larva, fourth instar, lateral aspect, showing general outline 



and spiracles 428 



9. Opius fletcheri: Spines on body of mature larva 428 



10. Opius fletcheri: Mandible of fourth-instar larva 429 



11. Opius fletcheri: Head of mature larva, dorso-cephalic aspect 429 



12. Opius fletcheri: Pupa, female 43° 



13. Opius fletclieri: Adult female 43 1 



Tamarind Pod-Borer, Sitophilus linearis (Herest) 

 Plate 



61. Sitophilus linearis: A. — Pupa, dorsal view. B. — Pupa, front view. 

 C. — Egg. D. — Mandible. E. — Mature larva. F. — Ventral view of 

 head. G. — Clypeus and labrum. H. — Pupa, lateral view. I. — Head, 

 face view. J. — Head, dorsal view. K. — Head, lateral view 446 



