(Source: Walker, Allan S., "Australia in the War of 19391945. Series 5 Medical - Volume Vol 1" (Sydney: Halstead Press, 1952), see "Section 1 - Infection Diseases (b) Vector-borne Group, Chapter 7 - Malaria", p. 76. Online at http://www.awm.gov.au/histories/second_world_war/volume.asp?levelID=67921.) 

(Note:  The notations in the adjoining text indicate that this map is referring to early 1942.)