Surveys of mosquitos in Sri Lanka have generally been confined to the South. A recent study in Jaffna peninsula in northern Sri Lanka reported on the biology of peridomestic mosquito species. The present survey indicates the predominant species to be Armigeres durhami (Edwaards) and Armigeres subalbatus (Coquillett). Aedes albopictus (Skuse), Ae. aegypti (Linnaeus) and Ae. novalbopictus Barraud were recorded only occasionally during the survey. Sampling of ponds in the Jaffna peninsula recorded the presence of Ae. aegypti, Anopheles sp. and Culex quinquefasciatus (Say).