LIST OF DRAWINGS 



FIG. TO FACE I'AOK 



1. A wood -boring beetle, Xyleborus dispar (female) . . .36 



2. A female locust laying eggs. (After Milliken) . . .30 



3. The Mexican cotton-boll weevil, Anthonomus yrandis. (After 



Hunter and Pierce) ........ 42 



4. The Mexican cotton-boll weevil, Anthonomus grandis, larva 



and pupa. (After Hunter and Pierce) .... 40 



5. Rostrum and beak of Mexican cotton-boll weevil. (After 



Hunter and Pierce) 40 



0. Larval burrow of the cotton-boll worm, Chloridea obsoleta. 



(Dept. of Agriculture, U.S.A.) 40 



7. The Periodical cicada, Cicada septendecim. (After Marlatt) . 54 



8. Organ of song of the Periodical cicada. (After Marlatt) . 54 



9. Ovipositor of the Periodical cicada. (After Marlatt) . . 54 



10. Periodical cicada larvae. (After Marlatt) .... 02 



11. Periodical cidada cones or chimneys. (Amended from 



Marlatt) 02 



12. Gipsy moth (female), Porthetria dispar 68 



13. Gipsy moth, first stage larva. (After Burgess) ... 68 



14. San Jose scale (male), A xpidiotus perniciosus. (After Marlatt) 72 



15. San Jos($ scale. (Alter Marlatt) . ... 72 



16. San Jose scale (female) before development of eggs. (After 



Marlatt) . 72 



17. Hessian fly (malel Cecidomyia destructor. (Dept. of Agri- 



culture, U.S.A.) 78 



18. Hessian fly, eggs and pupa. (Dent, of Agriculture, U.S.A.) . 78 



19. Phylloxera, Phylloxera wutatrix, larva 84 



20. Phylloxera, winged adult 84 



21. Blood ]>arasites of malaria 98 



22. Resting positions of mosquitoes 98 



23. Anopheles larva. (After Sambon) 100 



24. Culex larva. (After Sambon) . .... 100 



25. Mosquito eggs, Anojjheles up. . . . 102 



26. Pupae of Anopheles and Culex. (After Terzi in Manson's 



Tropical Diseases) 102 



27. Adult Anopheles beginning to emerge from its pupal case. 



(After Brumpt) . ... 104 



28. Ad u\t Anopheles almost free of its pupal case. (After Brumpt) 104 



29. Mosquito egg rafts. (After Sambon) 108 



30. Box designed by Dr L. Sambon for the transport of 



mosquitoes 108 



31. The yellow-fever mosquito (female), Stegomyia fasciata. 



(Imperial Bureau of Entomology) 110 



32. The stable fly, Stomoxys calcitra)is. (Castellani and Chalmers' 



Manual of 2'ropical Medicine) . . . . . .128 



33. A trypanosome ... 128 



13 



