The mosquitoes of the family Culicidae play a main role in the transmission of the myxomatosis. The species of Anopheles
and Aedes are the most important vectors in the transmission of this disease. In the Canary Islands, several species
of these genera have been reported (Baez 1987, Cordero del Campillo et al. 1994). Due to the climatic conditions on
Tenerife Island, the mosquito species can be present in every season and maintain the infection in the wild rabbits. The biogeographical conditions in several zones in Tenerife influence the density of mosquitoes. This fact could explain the seasonal character of the myxomatosis but no statistical differences were found in the prevalence in the four zones studied in the course of the present investigations.