“…Several workers have reported a burst of biting activity during the first 15-20 min in daytime bait catches followed by a decline in numbers (Germain et al, 1973;Mogi & Yamamura, 1981;Nishimura, 1982;Roberts & Scanlon, 1975;Service, 1969aService, , 1971bWellington, 1974), but McCrae et al (1976) working on Anopheles implexus in Uganda undertook the best analyses of this type of behaviour. They pointed out that during passive (opportunistic) biting by mosquitoes formerly resting amongst vegetation, there would be two principal categories; namely a static component (s) representing mosquitoes already present within the host's area of attraction, and a component of arrivals (a) flying into the host's attractant area after the bait had arrived.…”