55 
20 to 22. Swamps very extensive. Many Anophelines and numerous 
cases of malaria. Near the wheel house of the waterworks 
several examples of Megarhinus separatus and Mansonia 
longipalpis were captured. 
23. Sao Raymundo. District contains many swamps and is heavily 
infected with malaria. Cellia albimana and C. argyrotarsus 
very abundant. Many of the very poor inhabitants reside in 
the district. 
24. Colonia Oliveira Machado. Same conditions and class of 
residents as in No. 23. 
25. Low land near Rua dos Andrades. Many S/egomyia calopus, 
Mansonia titillans and Culex fatigans. Many cases of 
yellow fever have occurred in the neighbourhood. A great 
number of newly arrived Pcrtuguese, Italians and Spaniards 
reside in the houses, and create a serious condition of affairs 
through the overcrowding of the houses and their unhygemc 
habits, and the presence also of a number of unscreened water 
barrels. 
26. Swamps. Heavily infected with malaria. 
2;. The Bosque, Pensador and Flores swamps are extensive. Many 
Uranotaenia lowii and Ur. geometrica. The Anophelines 
are very plentiful, and many severe cases of malaria occur 
amongst the residents living near these swamps. 
The curved line traced near Numbers 3, 4, 5 , 7 > 9, to the Igarape 
da Cachoeirinha roughly outlines the yellow fever area. Between 
this outline and the river front is the most densely populated section 
of Manaos, and the majority of the non-immune population reside 
within these limits. Included in this area is the older portion of the 
city. Outside of the traced outline many more Brazilians reside, and 
the blocks of streets are not so densely populated. 
