LIST OF ILLUSTRATIONS 



Frontispiece 



FIG. 1a. " Wiggle-waggle," Larva of Stegomyia calopus^ 



„ 1b. Stegomyia calopus j 



FIG. PAOINa PAGE 



2. A well-constructed Drain and Standpipe, the Agents which 



HAVE caused the DIMINUTION OF MOSQUITOS, TrINIDAD . . 12 



' 3. A WELL-MADE ROAD WITH CONCRETE SiDE-DRAINS, TrINIDAD . 14 



4. A Large Concrete Drain to carry off Storm Water, Trinidad 16 



5. A So-called Yellow Fever House, Barbados . . . .18 



6. CuLEX. Attitude at Rest (after Ross). One of the Carriers 



OF FiLARIA 34 



7. Anopheles Mosquito. Observe Spotted Wings ... 38 



8. Rafts of Eggs of an Anopheline Floating on Water . . 38 



9. Characteristic Attitude op an Anopheline, the Mosquito 



which transmits Malaria ....... 40 



10. Anopheline Breeding Pools, after Rain, Sierra Leone . 42 



11. Anopheline Breeding Pools, Sierra Leone .... 42 



12. Street in Belize showing Grass-grown and Water-holding 



Side-drain. Anopheline Breeding Place .... 44 



13. Street in Belize showing Grass-grown and Water-holding 



Side-drain. Typical Breeding Place of Anophelines . 46 



14. Water-logged Anopheline Breeding Land, Belize ... 52 



15. House standing in Stagnant Water, Belize. Observe 



Water-barrels and Canoe ....... 56 



16. Old Method of Filling in Swamps by Hand Labour, Gold 



Coast 74 



17. Modern Method of Filling in Swamps by Sand Pump, Lagos, 



Southern Nigeria . . ... • • . . .74 



18. Road Pools, Village, West Africa. Breeding Places op 



Anophelines ... . . . . . . . .76 



19. Anopheline Breeding Pools, Sierra Leone .... 76 



20. Roadside Ditch containing Stagnant Water, breeding 



Anophelines. West Africa ....... 78 



21. Road Pools, West Africa . . .' 78 



22. Saman Tree covered with Water-holding Mosqihto-breeding 



Epiphytes (Bromeliace^), Trinidad ..... 92 



23. Too much Bush, Georgetown, Demerara. The effect is to 



obscure Sunlight and Fresh Air 94 



24. Collecting Crab-hole Mosquitos, Bridgetown, Barbados . 96 



25. A Properly Screened Cistern, New Orleans . . . 126 



XV 



