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Several species of mosquitoes are well known to be the serious vectors of epidemic diseases in the world. As a part of the basic survey to watch possible invasion of West Nile virus into Japan, mosquitoes were collected to elucidate their geographic and seasonal distributions in the urban area of Yo...

Cockroaches are common pests in urban environments around the world. A tremendous amount of papers have appeared on the behaviour of cockroaches. However, the details of their behaviour have not been completely clarified. We have already investigated the nocturnal behaviour of the German cockroach, ...

Observations of the nocturnal behaviour of the German cockroach, Blattella germanica, were carried out using single or mixed populations of males, gravid females, ungravid females and nymphs. The results of these studies can be summarised as follows: 1. The proportion of cockroaches present in a fee...