The diel oviposition cycle in Aedes albopictus (Skuse) was investigated under natural conditions at a site at Peradeniya, Sri Lanka. The pattern of egg laying demonstrated was essentially unimodal, most of the activity occurring between 1300-1900 hrs. with a sharp peak during the hour before sunset (1700-1800 hrs). Oviposition also occurred immediately after sunrise but the level of activity is...

Laurence & Smith (1958) and Laurence, Page & Smith (1962) have reported results of successful large scale rearing, in London, of Mansonia (Mansonioides) africana (Theobald) and M. (M.) uniformis from Africa and M. (M.) uniformis from Malaya. Laurence (1960) also studied the biology of these mosquitoes in the laboratory! Ceylon strains'of M. uniformis and M. annulifera were studied concurrendy w...